A friend-to-friend (or F2F) computer network is a type of peer-to-peer network in which users only make direct connections with people they know. Passwords or digital signatures can be used for authentication. F2F networks which don't offer automatic anonymous forwarding are ordinary private P2P networks. Many F2F networks support indirect anonymous or pseudonymous communication between users who don't know or trust one another. For example, a node in a friend-to-friend overlay can automatically… (More on Friend-to-friend)