The United States Trade Representative has a list of the worlds largest file sharing sites accused of file sharing infringement. The list comes for groups like RIAA and MPAA. Megaupload, BTjunkie and Demonoid have all been closed by this group. Pirate Bay is number one for Indexing but still remains online. Rutracker is not the number one tracker with Demonoid gone. They are based out of Russia.