Anonymous Speech Online: What the Law Protects — and Where It Stops

Anonymous speech has a long American pedigree, but anonymity is not the same thing as impunity. From the founding era forward, Americans have used unsigned pamphlets, pseudonymous essays, and concealed authorship to criticize power, test arguments, and protect dissenters from retaliation.² The Supreme Court has repeatedly recognized that anonymity can be part of the freedom of speech itself.³ But the internet has made an old principle harder to apply. Online anonymity can protect whistleblowers, dissidents, and unpopular speakers. It can also be invoked by people who want to defame, threaten, or harass others while making accountability harder.⁴

That tension is where the real law lives.

The first thing to get right is the constitutional baseline. The Supreme Court in McIntyre v. Ohio Elections Commission called anonymous pamphleteering “an honorable tradition of advocacy and of dissent” and struck down an Ohio law requiring identification on campaign literature.⁵ Earlier, in Talley v. California, the Court invalidated a city ordinance that banned distribution of anonymous handbills.⁶ And in NAACP v. Alabama ex rel. Patterson, the Court held that compelled disclosure of an organization’s membership lists could violate the freedom of association because disclosure could expose members to economic reprisal, loss of employment, and threats of physical coercion.⁷ Those cases establish a core point: forcing identification can itself burden First Amendment activity.⁸

The same principle appears in later cases involving advocacy and disclosure. In Watchtower Bible & Tract Society of New York, Inc. v. Village of Stratton, the Court struck down a permit-and-registration requirement for door-to-door advocacy, emphasizing among other things the value of spontaneous and anonymous speech.⁹ More recently, in Americans for Prosperity Foundation v. Bonta, the Court invalidated California’s blanket compelled disclosure of major donors to charities, concluding that broad disclosure rules can chill association and must survive exacting scrutiny.¹⁰ Anonymous speech, then, is not some fringe doctrine. It is part of a larger First Amendment concern with retaliation, chilling effects, and compelled exposure.¹¹

But that does not mean anonymous speech is immune from valid legal claims.

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Courts have never treated anonymity as a license for defamation or true threats.¹² New York Times Co. v. Sullivan constitutionalized libel law for public officials by requiring proof of actual malice—knowledge of falsity or reckless disregard for truth.¹³ Gertz v. Robert Welch, Inc. later held that private plaintiffs need not satisfy the Sullivan rule, but states may not impose defamation liability without fault.¹⁴ And Milkovich v. Lorain Journal Co. rejected the notion that simply labeling something “opinion” automatically immunizes a defamatory factual assertion.¹⁵ In other words, anonymity may affect the process of identifying a speaker, but it does not rewrite the substantive law of defamation.¹⁶

That is the distinction many people miss. The real legal fight in anonymous online speech cases is often procedural: what must a plaintiff show before a court will allow discovery designed to identify the anonymous speaker?¹⁷

There is no single nationwide unmasking test. Different courts use different formulations, even though several influential cases point in a similar direction.¹⁸ One major case is Dendrite International, Inc. v. Doe No. 3, a New Jersey appellate decision that required notice to the anonymous poster, identification of the specific allegedly actionable statements, a prima facie showing on the claim, and then a balancing of the strength of the plaintiff’s case against the speaker’s First Amendment interest in anonymity.¹⁹ Delaware’s Supreme Court, in Doe v. Cahill, rejected a weak good-faith standard and required a defamation plaintiff seeking to identify an anonymous online speaker to present evidence sufficient to survive a motion for summary judgment.²⁰ New Hampshire adopted a modified Dendrite approach in *Mortgage Specialists, Inc. v. Implode-Explode Heavy Industries, Inc.*²¹ Maryland likewise required notice and a meaningful threshold showing in Independent Newspapers, Inc. v. Brodie.²²

The common theme is clear even if the tests differ: courts are often wary of letting plaintiffs use a bare complaint and a subpoena to unmask anonymous speakers too cheaply.²³

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The Ninth Circuit added an important nuance in In re Anonymous Online Speakers. It did not announce one universal test for all anonymous internet speech. Instead, it stressed that online speech “stands on the same footing as other speech” and that the level of scrutiny can vary depending on the circumstances and the type of speech at issue.²⁴ That matters because the law is sensitive to context. Anonymous political speech is not analyzed in exactly the same way as anonymous commercial disparagement, a consumer review, or an alleged threat.²⁵

This is why internet anonymity cases often begin the same way. A plaintiff who does not know the speaker’s identity sues a “John Doe” and then serves subpoenas on intermediaries—platforms, hosts, registrars, ISPs, or other service providers—seeking identifying information.²⁶ The legal battle usually starts before the merits of the defamation claim are ever resolved. The immediate issue is whether the plaintiff has made a sufficient showing to justify disclosure.²⁷ So anonymity’s real battlefield is usually pre-merits discovery, not final liability.²⁸

Still, anonymous speakers should not romanticize the shield. The First Amendment does not protect false factual accusations simply because they were made under a pseudonym.²⁹ Nor does it protect true threats. In Virginia v. Black, the Supreme Court reiterated that true threats are outside First Amendment protection.³⁰ The law protects anonymous speech because anonymity can preserve space for dissent, advocacy, and association—not because it gives speakers a right to accuse others falsely and then disappear from legal accountability altogether.³¹

That is also where ethics matter.

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There is a real moral and strategic difference between anonymous whistleblowing and anonymous targeting. A source who leaks documents exposing public corruption is not the same as a person who builds a secret one-subject website to injure a private enemy. The First Amendment cases do not always phrase the distinction exactly that way, but the equities show up in doctrine. The stronger the public-interest value of the speech, the more the case resembles classic protected dissent. The more the speech looks like defamation, intimidation, or campaign-style personal targeting, the weaker the speaker’s claim to anonymity becomes once a plaintiff makes the necessary showing.³²

The best way to understand anonymous speech law is therefore modestly, not magically. Anonymous speech is real speech. It has constitutional value. Courts should not let plaintiffs unmask critics casually or with paper-thin claims.³³ But anonymity is not invisibility, and it is not impunity. It is a constitutionally significant interest that courts often weigh against another significant interest: the right not to be falsely and unlawfully defamed.³⁴

That balance is the point.

And if the internet age has taught courts anything, it is that both errors are dangerous: forcing exposure too easily, and pretending anonymity erases responsibility altogether.³⁵

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Footnotes

¹ See generally McIntyre v. Ohio Elections Comm’n, 514 U.S. 334 (1995), https://www.law.cornell.edu/supremecourt/text/514/334.

² See id. at 341–43; Talley v. California, 362 U.S. 60, 64–65 (1960), https://www.law.cornell.edu/supremecourt/text/362/60.

³ McIntyre, 514 U.S. at 341–42; Talley, 362 U.S. at 64–65.

⁴ See Doe v. Cahill, 884 A.2d 451, 456–61 (Del. 2005), https://www.eff.org/files/filenode/Doe_v_Cahill/doe_v_cahill_decision.pdf; Dendrite Int’l, Inc. v. Doe No. 3, 775 A.2d 756, 760–61 (N.J. Super. Ct. App. Div. 2001), https://www.citizen.org/wp-content/uploads/dendriteappeal.pdf.

⁵ McIntyre, 514 U.S. at 357.

⁶ Talley, 362 U.S. at 64–65.

⁷ NAACP v. Alabama ex rel. Patterson, 357 U.S. 449, 462–63 (1958), https://www.law.cornell.edu/supremecourt/text/357/449.

⁸ Id.; McIntyre, 514 U.S. at 341–42.

⁹ Watchtower Bible & Tract Soc’y of N.Y., Inc. v. Vill. of Stratton, 536 U.S. 150, 166–68 (2002), https://www.law.cornell.edu/supremecourt/text/536/150.

¹⁰ Americans for Prosperity Found. v. Bonta, 594 U.S. 595, 606–16 (2021), https://www.law.cornell.edu/supremecourt/text/19-251.

¹¹ See NAACP, 357 U.S. at 462–63; Americans for Prosperity, 594 U.S. at 606–16.

¹² See N.Y. Times Co. v. Sullivan, 376 U.S. 254 (1964), https://www.law.cornell.edu/supremecourt/text/376/254; Virginia v. Black, 538 U.S. 343, 359–60 (2003), https://www.law.cornell.edu/supremecourt/text/538/343.

¹³ Sullivan, 376 U.S. at 279–80.

¹⁴ Gertz v. Robert Welch, Inc., 418 U.S. 323, 347–50 (1974), https://www.law.cornell.edu/supremecourt/text/418/323.

¹⁵ Milkovich v. Lorain J. Co., 497 U.S. 1, 18–21 (1990), https://www.law.cornell.edu/supremecourt/text/497/1.

¹⁶ See Sullivan, 376 U.S. at 279–80; Gertz, 418 U.S. at 347–50; Milkovich, 497 U.S. at 18–21.

¹⁷ See Cahill, 884 A.2d at 456–61; Dendrite, 775 A.2d at 760–61.

¹⁸ See Cahill, 884 A.2d at 456–61; Dendrite, 775 A.2d at 760–61; Mortgage Specialists, Inc. v. Implode-Explode Heavy Indus., Inc., 999 A.2d 184, 192–97 (N.H. 2010), https://law.justia.com/cases/new-hampshire/supreme-court/2010/2010041mortg.html; Indep. Newspapers, Inc. v. Brodie, 966 A.2d 432, 442–61 (Md. 2009), https://www.mdcourts.gov/data/opinions/coa/2009/63a08.pdf.

¹⁹ Dendrite, 775 A.2d at 760–61, 772.

²⁰ Cahill, 884 A.2d at 460–61.

²¹ Mortgage Specialists, 999 A.2d at 192–97.

²² Brodie, 966 A.2d at 456–61.

²³ See id.; Cahill, 884 A.2d at 457–61; Dendrite, 775 A.2d at 760–61, 772.

²⁴ In re Anonymous Online Speakers, 661 F.3d 1168, 1173 (9th Cir. 2011), quoted in Anderson v. Perez, No. 23-2790, slip op. at 3–4 (9th Cir. Oct. 11, 2024), https://law.justia.com/cases/federal/appellate-courts/ca9/23-2790/23-2790-2024-10-11.html.

²⁵ In re Anonymous Online Speakers, 661 F.3d at 1173, as quoted in Anderson, No. 23-2790, slip op. at 3–4; see also Doe v. Harris, 772 F.3d 563, 574–76 (9th Cir. 2014), https://cdn.ca9.uscourts.gov/datastore/opinions/2014/11/18/13-15263.pdf.

²⁶ See Cahill, 884 A.2d at 454–56.

²⁷ Id. at 456–61; Dendrite, 775 A.2d at 760–61.

²⁸ See Cahill, 884 A.2d at 456–61.

²⁹ Milkovich, 497 U.S. at 18–21; Sullivan, 376 U.S. at 279–80.

³⁰ Virginia v. Black, 538 U.S. at 359–60.

³¹ See McIntyre, 514 U.S. at 341–42; NAACP, 357 U.S. at 462–63.

³² See Brodie, 966 A.2d at 456–61; Mortgage Specialists, 999 A.2d at 192–97; In re Anonymous Online Speakers, 661 F.3d at 1173, as quoted in Anderson, No. 23-2790, slip op. at 3–4.

³³ Cahill, 884 A.2d at 460–61; Dendrite, 775 A.2d at 760–61, 772.

³⁴ See Sullivan, 376 U.S. at 279–80; Gertz, 418 U.S. at 347–50; Milkovich, 497 U.S. at 18–21.

³⁵ See McIntyre, 514 U.S. at 341–42; Cahill, 884 A.2d at 456–61; Dendrite, 775 A.2d at 760–61, 772.