We all know the numbers by now. Some 50 million U.S. Internet users have used file-sharing platforms. Popular networks like Gnutella/Limewire and eMule together make up for eight to nine million simultaneous users at any given time. And BitTorrent is responsible for 30 to 50 percent of all internet traffic, give or take. But there is a whole world of P2P services with millions of users out there t