The Electronic Privacy Information Center and 10 other privacy and civil rights advocacy groups have asked the Federal Trade Commission (FTC)  to investigate Facebook's use of cookies and recent changes to its site, The Washington Post reports. The request follows an Australian technologist's discovery earlier this week that the site tracked users even after they'd logged out. Facebook has since reportedly made changes addressing the concerns. The groups have also raised concerns about Facebook's new "Timeline" feature, writing in a letter to the FTC that it is a "treasure trove of personal information" that could "provide a tempting target for stalkers, government agents or employers." (Registration may be required to access this story.) 
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