The most well-known examples are, of course, Moot and Jim Watkins' testimonies under oath, but there are probably many more floating around.
* '''4chan''' - Despite its notoriety, only two major court cases mention 4chan, one in passing but one with a subpeona calling 4chan founder Christopher Poole (Moot) to testify, thereby recording 4chan's existence in court precedent for time immemorial.
** [https://www.courtlistener.com/opinion/621755/united-states-v-kernell/?q=4chan&type=o&order_by=score+desc&stat_Precedential=on United States v. Kernell, 667 F.3d 746 (6th Cir. 2012)] & [https://www.courtlistener.com/opinion/2469889/united-states-v-kernell/?q=4chan&type=o&order_by=score+desc&stat_Precedential=on United States v. Kernell, 742 F. Supp. 2d 904 (E.D. Tenn. 2010)] - When a 4chan user was arrested for hacking into Vice Presidential Candidate Sarah Palin's Yahoo.com email account, given that the user discussed, leaked to, and was goaded upon by other users of the site, the court deemed it necessary to issue a subpeona to Christopher Poole (Moot) under pain of oath as a witness to describe the website and terminology in full.