Wikipedia as Illustration of the Truth-Seeking Rationale for Freedom of Expression

By Mark Cenite

Empirical evidence for the truth-seeking rationale for freedom of expression – the assertion that truth prevails in a free marketplace of ideas – is difficult to interpret. Analysis of how Wikipedia functions, and the accuracy of its content, provides preliminary indications of the validity of the truth-seeking rationale and its limits.


A rationale for protecting freedom of expression that ranks among the most cited is the truth-seeking rationale. According to this rationale, information and opinion should circulate free of government controls. The sanguine conclusion is that truth, or at least the best ideas, will prevail in the end. The evidence for this sweeping conclusion is limited and disputable, as this article demonstrates. Given the paucity of solid evidence from other contexts, this article suggests that Wikipedia can serve as an illustration of how relatively unfettered expression can lead to the best content prevailing, at least in some circumstances. 

Despite the limited evidence for it, citations of three famous sources of the truth-seeking rationale are frequent. An early expression of the rationale is from English poet John Milton’s Areopagitica (1644), his defense of free speech, in which he uses a metaphor of Truth and Falsehood wrestling and Truth winning in a fair match.1 Areopagitica has been cited 478 times in law review articles published since 1982 that are available in LexisNexis Academic; there are also 49 citations of it in federal and state cases available in the LexisNexis database from throughout United States legal history.2 Another source for the rationale is English philosopher John Stuart Mill’s On Liberty (1859), in which he advanced the argument that truth will prevail and that a side effect of the struggle to identify the truth is that participants in the debate, and those in the audience, may gain a keener appreciation of the truth that finally emerges. A search for citations of Mill’s On Liberty and “free speech” returns 1,683 hits from law reviews and 65 hits from the US cases since Mill’s publication of the work.3 Justice Oliver Wendell Holmes is often cited for the view the truth would prevail in the “marketplace of ideas”, though Holmes did not actually use the exact phrase, but instead words with similar meaning: “[T]he best test of truth is the power of the thought to get itself accepted in the competition of the market.”4 A LexisNexis search for “Holmes” and “marketplace of ideas” yields 2,979 hits in law reviews and 193 hits in cases.

In the sentence after Holmes advanced this “marketplace of ideas” rationale, he wrote that it “is the theory of our Constitution. It is an experiment, as all life is an experiment. Every year, if not every day, we have to wager our salvation upon some prophecy based upon imperfect knowledge.”5 Is the rationale merely a prophecy? What are the results of the ongoing experiment? What evidence can one cite of the free marketplace of ideas actually creating conditions in which the best ideas prevail? We shall discuss national comparisons and a famous study of the incidence of famine in liberal democracies.  Though the illustration is imperfect, we argue that analysing Wikipedia as a contemporary example of a well-functioning free market of ideas is preferable to making a statement, on blind faith, that truth emerges.

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Mark Cenite is Associate Chair (Academic) at the Wee Kim Wee School of Communication & Information, part of Nanyang Technological University in Singapore. He has a law degree from Stanford Law School and a PhD in Communication from the University of Minnesota. He is a winner of multiple awards for teaching Law in Singapore, and has also taught Law in the United States and Hong Kong.


1. “And though all the windes of doctrin were let loose to play upon the earth, so Truth be in the field, we do injuriously, by licencing and prohibiting to misdoubt her strength. Let her and Falshood grapple; who ever knew Truth put to the wors, in a free and open encounter.” John Milton, Areopagitica (1644).
2. Results reported here were from searches conducted on 19 September 2016 in the LexisNexis database in the category “US Law Reviews and Journals” from all available dates (since 1982), and in the category “US Federal & State Cases” from all available dates. The search term used was simply the title “Areopagitica.”
3. The search terms  were “Mill” within 5 words (/5) of “On Liberty” and the term “free speech”.
4. Abrams v. United States, 250 U.S. 616, 630 (1919) (Holmes, J., dissenting).
5. Abrams, 250 U.S. 616, 630 (Holmes, J., dissenting).<
6. Reporters Without Borders is available at; Freedom House is available at A podcast criticising the methodology of Reporters Without Borders is Bob Garfield’s interview with Max Fisher, “No, US press freedom is not in dire decline,” WNYC’s On The Media, Feb. 14, 2014, at
7. Amartya Sen, Development as Freedom (1999).
8. Alexander Bickel, The Morality of Consent 71, 76-77 (1975).
9. Lee C. Bollinger, The Tolerant Society 74 (1986).
10. Jerome A. Barron, Access to the Press: A New First Amendment Right, 80 Harv. L. Rev. 1641-1678 (1967).
11. “Intellectual Free-For-All Not for the Masses, Says SM Lee,” Business Times (Singapore) (Oct. 6, 1995).
12. See Alexa Internet, <
13. “Wikipedia: Rules,”
14. “Wikipedia: Neutral point of view,”
15. “Wikipedia: Tagging pages for problems,”
16. “Wikipedia: Edit War,”
17. “Wikipedia: Vandalism,”
18. “Will Wikipedia Mean the End Of Traditional Encyclopedias?” The Wall Street Journal (Sept. 12, 2006).
19. Thomas I. Emerson, The Doctrine of Prior Restraint, 20 Law and Contemporary Problems 648-671 (1955), at:
20. Wikimedia reports that Wikipedia received 243 requests to take down content from January through June of 2016 and none were granted. See
21. There are some caveats to the argument that Wikipedia is free of government control, for authorities can of course punish contributors in their jurisdictions, and nations including China block Wikipedia, thus blocking not only readers but contributors. See Jimmy Wales, “State of the Wiki: Free Expression and Wikipedia,” speech at Wikimania 2015, at
22. Jim Giles, Internet Encyclopaedias Go Head to Head, 438 Nature 900-901 (15 December 2005).
23. Imogen Casebourne, Chris Davies, Michelle Fernandes, & Naomi Norman (2012), Assessing the Accuracy and Quality of Wikipedia Entries Compared to Popular Online Encyclopaedias: A Comparative Preliminary Study across Disciplines in English, Spanish and Arabic. Retrieved from:
24. Malolan S. Rajagopalan, Vineet K. Khanna, Yaacov Leiter, Meghan Stott, Timothy N. Showalter, Adam P. Dicker & Yaacov R. Lawrence, Patient-Oriented Cancer Information on the Internet: A Comparison of Wikipedia and a Professionally Maintained Database. 7 Journal of Oncology Practice 319-323 (2011), at

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