In an interview with Russia Today, WikiLeaks founder Julian Assange went all conspiracy theorist on Facebook. He says:
Facebook in particular is the most appalling spying machine that has ever been invented. Here we have the worlds most comprehensive database about people, their relationships, their names, their addresses, their location their communication with each other, their relatives...all accessible to US intelligence.
Assange didn't out and declare Facebook was working in cahoots with US intelligence but said that:
Everyone should understand that when they add their friends to Facebook, they are doing free work for United States intelligence agencies, and building this database for them