The following article provides links to information on multiple different surveillance methods:

Americans Are The Most Spied On People In World History
www.washingtonsblog.com | December 5, 2012

More Spying On Citizens than in Stasi East Germany

TechDirt notes:

“In a radio interview, Wall Street Journal reporter Julia Angwin (who’s been one of the best at covering the surveillance state in the US) made a simple observation that puts much of this into context: the US surveillance regime has more data on the average American than the Stasi ever did on East Germans….”