WASHINGTON (AP) - Popular social-networking sites have attracted millions of users - and the feds.
Law enforcement agents are signing on to Facebook, MySpace, LinkedIn and Twitter, going undercover to communicate with suspects and gather information.
An internal Justice Department document, obtained in a Freedom of Information Act lawsuit, describes the value of social networking sites to government investigators.
But civil liberties attorney Marcia Hoffman says there's not much about accountability and responsible use.
The Justice Department says the actions are legal and there are internal rules, though officials would not say what the rules are.
But investigators are essentially using the same tactic that got a a Missouri woman charged with computer fraud for creating a fake MySpace account in a cyber-snooping case.