The Electronic Frontier Foundation has obtained documents showing how U.S. law enforcement agencies and the Internal Revenue Service are gathering information from social networking sites for their investigations.
The U.S. Department of Defense has approved access to social-networking sites from its network. Military troops and other DoD workers can now use Facebook and Twitter, following bans in some branches.
Facebook's recent move to allow users to share information to an unlimited number of friends puts it in direct competition with micro-blogging site Twitter