1. Introduction
The extent of publication is a fundamental element in defamation proceedings that influences both liability and the assessment of damages. A precise understanding of how to evaluate and prove publication extent is essential, particularly given the evolving media landscape and recent legislative reforms. This section provides guidance on the principles and evidentiary considerations relevant to determining the extent of publication in defamation matters, with particular attention to Western Australian jurisprudence where applicable.
2. Publication: Fundamental Principles
2.1 The Bilateral Nature of Publication
Publication in defamation law is a bilateral process requiring both the communication of defamatory matter by a publisher and its comprehension by at least one third party. As the High Court observed in Dow Jones & Company Inc v Gutnick (2002) 210 CLR 575 at [26]:
"Harm to reputation is done when a defamatory publication is comprehended by the reader, the listener, or the observer. Until then, no harm is done by it. This being so it would be wrong to treat publication as if it were a unilateral act on the part of the publisher alone. It is not. It is a bilateral act—in which the publisher makes it available and a third party has it available for his or her comprehension."
This bilateral conception has implications for proving both the fact and extent of publication. It means that publication is not complete until the defamatory matter has been both communicated and comprehended. This requires plaintiff’s to adduce evidence not merely of dissemination but also of reception and understanding by third parties.
2.2 Single Publication Rule
It is important to note that the single publication rule does not currently (as at March 2025) apply in Western Australia. Consequently, in Western Australia, the multiple publication rule established in Dow Jones & Company Inc v Gutnick continues to apply. This means that each download of defamatory material constitutes a separate publication, with its own cause of action.
3. Proving Fact of Publication
Before addressing extent, it is necessary to establish the fact of publication. The plaintiff bears the legal burden of proving that:
The defamatory matter was communicated to at least one person other than the plaintiff;
That person comprehended the communication; and
The publication was the intended, or the natural and probable, consequence of the defendant's actions.
In Lazarus v Deutsche Lufthansa AG (1985) A Def R 36-401, Hunt J emphasised that the plaintiff bears the onus of proving publication and must establish not only that the defamatory matter was accessible to third parties but that it was in fact accessed and comprehended by them.
As stated in Sims v Jooste (No 2) [2016] WASCA 83, a plaintiff must demonstrate, by pleading, that the material was downloaded and viewed by at least one person. This Western Australian authority underscores the necessity of establishing actual communication to and comprehension by a third party.
3.1 Direct Evidence of Publication
The most straightforward way to prove publication is through direct evidence, which may include:
Testimony from recipients who read, heard, or viewed the defamatory material
Admission by the defendant of publishing the material to specific individuals or groups
Documentary evidence of distribution (email logs showing recipients, distribution lists, etc.)
Server logs or analytics data showing specific access to the particular content
Worked Example: A sends a defamatory email about B to C. C testifies in court that they received and read the email, understanding its defamatory meaning. This is direct evidence of publication to C.
3.2 Inferential Evidence of Publication
Direct evidence of publication is not always available, particularly with online publications. In such cases, the plaintiff may rely on inferential evidence to establish a "platform of facts" from which publication can be reasonably inferred. The Court of Appeal in Sims v Jooste (No 2) [2016] WASCA 83 confirmed that this approach is available in Western Australia.
However, mere speculation is insufficient. The plaintiff must present a compelling factual foundation from which the court can infer publication.
Worked Example (Insufficient Evidence): A posts a defamatory comment about B on a website hosted overseas. B provides evidence that the website has 10,000 visitors per month globally. This, alone, is likely insufficient to prove publication in Western Australia. There is no evidence that any of those visitors were in Western Australia or that they saw the specific comment.
Worked Example (Sufficient Evidence): A posts a defamatory comment about B, a Perth-based businessman, on a website hosted overseas. B provides evidence that: (a) the website has 10,000 visitors per month, and 2,000 of those visitors are from Australian IP addresses; (b) the comment was visible on the website for three months; (c) the comment received 50 "replies" from other users, some of whom appear to be based in Perth (based on their usernames and profile information); and (d) several of the replies specifically discuss the defamatory imputation and its impact on B's business in Perth. This combination of factors creates a strong inference that the comment was downloaded and comprehended by at least one person in Western Australia.
4. Proving Extent of Publication
Once the fact of publication is established, attention turns to its extent. This is relevant to the quantum of damages. The following considerations apply in different publication contexts:
4.1 Print Publications
For print publications, evidence of the following may be adduced:
Circulation figures (official audited figures are preferable)
Distribution area (with particular attention to the plaintiff's community of interest)
Readership estimates (which may exceed circulation)
Whether the publication was prominently placed (e.g., front page versus buried on page 20)
Whether the publication appeared in a specialist publication with a particularly influential readership among peers of the plaintiff
As held in Attrill v Christie [2007] NSWSC 1386, the extent of publication may be proved by inference from circulation figures, and the court may infer that a substantial proportion of readers actually read the material in question.
Worked Example: In a defamation action concerning an article in a major metropolitan newspaper, evidence might include the newspaper's audited circulation figures (approximately 100,000 copies), readership multiplier (estimated 2.5 readers per copy), distribution throughout metropolitan and regional areas of the state, and particulars about the prominence of the article (front page above the fold versus an inside page). The court may infer that a substantial proportion of the readership comprehended the defamatory matter, particularly if it was prominently placed.
4.2 Online Publications
For online publications, relevant evidence may include:
Number of unique visitors to the specific webpage containing the defamatory material
Average time spent on the page (as a proxy for comprehension)
Geographical location of visitors (particularly important for establishing jurisdiction in Western Australia)
Prominence in search engine results when searching for the plaintiff's name
Social media engagement metrics (shares, comments, likes)
Expert evidence on typical reading patterns for the type of content
It is important to note that analytical data showing mere page impressions or views may not, without more, be sufficient to establish comprehension by third parties. As established in Visscher v Maritime Union of Australia (No 6) [2014] NSWSC 350, more detailed evidence about engagement with the content may be necessary to satisfy the bilateral nature of publication.
Worked Example: In a case concerning a defamatory article on a news website, analytics data might show 5,000 page views, with 3,750 visitors from Western Australia, an average time on page of 2.5 minutes (suggesting the content was read rather than merely glimpsed), and 127 social media shares. A court might accept this evidence as establishing substantial publication within Western Australia, particularly if supported by expert evidence that the average time spent on the page exceeds the minimum time necessary for a typical reader to comprehend the defamatory content.
4.3 Social Media Publications
For social media publications, relevant considerations include:
Number of followers/friends/connections of the publisher
Number of views, likes, comments, or shares
Whether the post was public or restricted to a defined audience
Duration of availability before removal (if applicable)
Evidence of republication through sharing, screenshots, or archiving
Expert evidence on algorithmic amplification within the platform
In Wilson v Ferguson [2015] WASC 15, Mitchell J considered the extent of publication in relation to intimate images shared on Facebook, taking into account not only the direct recipients but also the potential for further dissemination. His Honour noted at [79] that the "grapevine effect" was particularly potent in the context of social media publications.
Worked Example: In a matter involving a defamatory Facebook post, evidence might include the defendant's friend count (2,500), engagement metrics (45 likes, 23 comments, 12 shares), public accessibility settings, and duration of availability (3 months before removal). Expert evidence might also establish the likely amplification through the Facebook algorithm, which may have shown the content to users beyond the defendant's immediate connections based on engagement levels.
5. Evidentiary Challenges
5.1 Inferential Reasoning
Courts may draw inferences about the extent of publication based on circumstantial evidence. As Hunt J observed in Urbanchich v Drummoyne Municipal Council (1991) Aust Torts Reports 81-127 at 69,193:
"Where the plaintiff has established that the defendant published the statement to a limited class of persons only, the court will infer, in the absence of evidence to the contrary, that all persons within that class both received and read the statement."
This principle is useful for assessing publication in traditional media contexts. However, in Nationwide News Pty Ltd v Naidu (2007) 71 NSWLR 471, the NSW Court of Appeal emphasised that while inferential reasoning is permissible, it must have a proper evidentiary foundation and not amount to speculation.
It is important for Western Australian practitioners to note that inferential reasoning may be particularly appropriate in regional or remote communities, where media consumption patterns may differ from metropolitan areas.
5.2 Online Publication Challenges
Proving the extent of online publication presents unique challenges. While analytics data can provide quantitative evidence, it may not definitively establish comprehension. Judges should critically evaluate:
The reliability and authentication of analytics evidence
Whether metrics demonstrate actual reading versus mere impressions
The methodology employed by expert witnesses in interpreting online data
The relationship between technical data and actual comprehension
The relevance of the data to the specific defamatory content (as opposed to the webpage generally)
In Al Muderis v Duncan (No 3) [2017] NSWSC 726, McCallum J accepted expert evidence regarding internet analytics to determine the extent of publication of defamatory material online. Importantly, her Honour scrutinised the methodology behind the analytics and required evidence that went beyond mere page views to establish that the defamatory content had been comprehended.
5.3 Grapevine Effect
The "grapevine effect" recognises that defamatory material may spread beyond its initial publication through informal channels. In Palmer Bruyn & Parker Pty Ltd v Parsons (2001) 208 CLR 388 at [88], the High Court acknowledged that a plaintiff may recover damages for the spread of defamatory imputations through the "grapevine," even without strict proof of each instance of republication.
For Western Australian practitioners, it is worth noting that evidence of the potential for grapevine dissemination is particularly relevant in regional communities, where information may spread rapidly through informal networks. This phenomenon was recognised in West Australian Newspapers Ltd v Elliott [2008] WASCA 172, where the Court of Appeal acknowledged the amplified impact of defamatory publications in smaller, close-knit communities.
Importantly, in Zimmerman v Perkiss [2022] NSWDC 448, the court considered that the lack of the "grapevine effect"—the absence of evidence that others discussed the defamatory material with each other—was a factor in assessing the extent of harm to the plaintiff's reputation.
However, care should be taken to distinguish between the grapevine effect (which concerns damages for foreseeable further dissemination) and direct liability for republication by third parties. As clarified in Sims v Wran [1984] 1 NSWLR 317, a defendant is generally not liable for republication unless it was specifically authorised or was the natural and probable consequence of the original publication.
6. Publication by Omission
Courts distinguish between publication occurring by way of a positive act and publication occurring through omission. For publication by omission, the test is whether the defendant consented to, approved of, adopted, promoted, or in some way ratified the continued presence of defamatory material.
This principle was articulated in Byrne v Deane [1937] 1 KB 818 and developed in the Australian context in Thompson v Australian Capital Television (1996) 186 CLR 574. More recently, in Trkulja v Google LLC (2018) 263 CLR 149, the High Court considered the potential liability of search engines for failing to remove defamatory search results after being notified of their existence.
The question of publication by omission becomes particularly important in the context of user-generated content on websites, forums, and social media platforms. The defence of innocent dissemination under s 32 of the Defamation Act 2005 (WA) may be negated if the defendant fails to take reasonable steps to remove defamatory material after being notified of its existence.
Worked Example: A Western Australian website owner receives notification that user-generated content on their site contains defamatory material about a Perth businessperson. If they fail to remove it within a reasonable time after being notified (what constitutes "reasonable" will depend on the circumstances, including the technical complexity of removal and the resources of the website owner), they may be liable as a publisher by omission, having effectively adopted responsibility for the continued publication.
7. Jurisdictional Considerations
For Western Australian judges and practitioners, it is important to note that under the multiple publication rule established in Dow Jones & Company Inc v Gutnick, defamation occurs wherever the material is downloaded and read. This means that Western Australian courts have jurisdiction over defamation actions where the material was accessed in Western Australia, regardless of where it was uploaded.
As confirmed in Crosby v Kelly [2012] FCAFC 96, Australian courts retain jurisdiction over defamation actions where publication occurs within Australia, regardless of the original location of the publisher.
Western Australian practitioners should be particularly attentive to:
Establishing evidence of access within Western Australia
The continuing application of the multiple publication rule in Western Australia
Potential conflict of laws issues for interstate and international publications
The practical difficulties of enforcing judgments against interstate or international defendants
8. Particulars of Publication
While the plaintiff does not necessarily need to identify the specific individuals who accessed the defamatory material, providing particulars of downloading is now general practice in Western Australia. As noted in Sims v Jooste (No 2) [2016] WASCA 83, the court may require the plaintiff to provide further and better particulars if the initial pleading is vague or insufficient.
These particulars should address:
When and where the material was published
The identity or class of the recipients (if known)
Evidence supporting the inference of publication (for inferential cases)
The extent of publication claimed
The jurisdictional nexus with Western Australia
9. Procedural issues for Evidentiary Management
When seeking to use the forensic tools available in a court case, in relation to evidence regarding publication extent, parties should consider:
Orders (such as leave to issue interrogatories) seeking specific disclosure of analytics data for online publications, including raw data to allow for expert analysis
Requiring expert evidence on digital distribution mechanisms where necessary, with attention to the expert's methodology and assumptions
Considering whether sampling methods might be appropriate for establishing patterns of publication in cases involving voluminous material
Setting parameters for inferential reasoning about publication extent
Requiring particulars of the grapevine effect where it is pleaded
Directing that evidence address not merely dissemination but also comprehension by recipients
In complex matters involving multiple publication platforms, it may be appropriate to direct the preparation of a publication schedule that clearly identifies each publication, its extent, and the evidence supporting those contentions.
10. Conclusion
Proving the extent of publication involves both factual and inferential reasoning, underpinned by an understanding of the bilateral nature of publication. The emergence of digital media has complicated this assessment but has also provided new evidentiary tools. Western Australian judges and practitioners should approach these questions with careful attention to both traditional principles and emerging digital realities.
The extent of publication remains a critical factor in assessing damages in defamation proceedings. As the media landscape continues to evolve, so too will the evidentiary approaches to establishing publication extent. Judges and practitioners should remain attuned to developments in this area, particularly as courts grapple with the implications of social media algorithms, ephemeral content, encrypted messaging platforms, and artificial intelligence-generated content.
For Western Australian practitioners, particular attention should be paid to regional and remote publication contexts, the continuing application of the multiple publication rule, and the developing jurisprudence as it relates to publication extent.