Nine privacy groups have sent a joint letter to the Federal Trade Commission saying it should investigate the ways Facebook collects data about users' online activity after recent changes to its site.
The Electronic Privacy Information Center, the American Civil Liberties Union and other groups sent the letter to the FTC Wednesday.
The groups say changes Facebook made last week give it far greater ability to disclose users' personal information to businesses than it used to have.
Facebook users can now consent just once and have applications continuously share on Facebook the music they are listening to or the articles they are reading.
Facebook says that change gives users control over what apps they use and what information is shared.
The letter does not constitute a formal complaint.