associated with unmoderated Usenet groups. Economist Tyler Cowen wrote: "If I had to guess whether Wikipedia or the median refereed journal article on economics was more likely to be true, after a not so long think I would opt for Wikipedia." He comments that some traditional. 337 338 Sister projects Wikimedia Main article: Wikimedia project Wikipedia has also spawned several sister projects, which are also wikis run by the Wikimedia Foundation. Complete bans from Wikipedia are generally limited to instances of impersonation and anti-social behavior. 303 Content appearing on Wikipedia has also been cited as a source and referenced in some US intelligence agency reports. 8th Annual Collaboration, Electronic Messaging, Anti-Abuse, and Spam Conference. "It's a Wiki, Wiki World". Retrieved October 22, 2009. Volunteers Log Off as Wikipedia Ages, The Wall Street Journal, November 27, 2009. In December 2008, access to the Wikipedia article Virgin Killer was blocked for four days by most Internet service providers in the United Kingdom after the Internet Watch Foundation (IWF) decided the album cover was a potentially illegal indecent. Dispute Resolution Coldewey, Devin (June 21, 2012). Michael Snow (December 29, 2016). 210 That law bans photographic child pornography and cartoon images and drawings of children that are obscene under American law. Retrieved March 25, 2007. 16 In 2005, Nature published a peer review comparing 42 hard science articles from Encyclopaedia Britannica and Wikipedia and found that Wikipedia's level of accuracy approached that of Britannica, 17 although critics suggested that it might. Archived from the original (PDF) on January 25, 2006.