“It was confirmed earlier this month that the FBI shares its master watchlist, the Terrorist Screening Database, with at least 22 foreign governments, countless federal agencies, state and local law enforcement, plus private contractors. The standards are so low that the US government’s guidelines specifically allow for a single, uncorroborated source of information – including a Facebook or Twitter post – to serve as the basis for placing you on its master watchlist. Of the 680,000 individuals on that FBI master list, roughly 40% have ‘no recognized terrorist group affiliation’, according to the Intercept, but they are still branded as suspected terrorists.”
http://www.theguardian.com/commentisfree/2014/aug/30/terrorist-watch-list-rules-innocent-people