There have been no challenges of any of the warrants on the grounds that they were a violation of a user's Fourth Amendment rights regarding unlawful search and seizure, but that may be because the users, as well as any friends with whom they are linked on Facebook and whose pages might have been examined as part of an investigation, weren't aware of the searches

Raw numbers from TwitSprout put that at about 0.045 percent of all questions posed online before and during the presidents Q&A, based on figures showing that an estimated Twitter users posted 40,000 questions for the president.

Lulz, which recently called for "war" on governments that control the internet, has boasted of hacking attacks on Sony and of taking down the C.I.A. website and breaching the U.S. Senate computer system.