December 2007.Facebook , a Canadian company specializing in Internet porn, for attempting to at least some 200,000 times to obtain information on its users. According to AVN, an adult entertainment news website, that case was settled in April 2008.  Under the deal, a permanent injunction was issued against the individuals involved in the incident and they promised not to become members of Facebook for ten years following the date of the settlement.

October 2009.Facebook is awarded $711 million in a civil judgment against Spam King who flooded the social network with junk messages. According to the lawsuit, Wallace and two cronies launched a phishing campaign on Facebook to promote porn and gambling sites and were guilty of more than 14.2 million violations of the U.S. .

April 2011.Facebook files a trademark infringement against website. Lawsuit alleges that the site rips off Facebook features such as profiles and a "like" button. It also encourages members to upload photos, preferably of the pornographic variety. after filing the lawsuit, Facebook obtained control of the facebookofsex.com domain.

May 2011.Facebook challenges a trademark filing with the U.S. Patent and Trademark Office (USPTO) by Shagbook, a site for "no strings attached adult dating" located in the United Kingdom. In with the USPTO, Facebook claims that Shagbook's logo is "highly similar" to Facebook's; its services are similar to those offered by Facebook; and that Shagbook was designed to "trade off the fame" of the social network.

Several months later (August 2011), Shagbook answered Facebook's USPTO filing with its own. In that , Shagbook questions whether the word "facebook" can be trademarked. It argued that the "term was in common use in the English language well before [Facebook] began using the term in connection with its services." It added that Facebook was "engaged in trademark misuse and trademark bullying by abusively using oppositions, litigation, and threats of the same to maintain a competitive market advantage."