Allows you to create your own social network.
Cost: Free
A social network for professionals.
Cost: Free
A popular social network.
Cost: Free
A microblogging and social messaging utility for staying connected in real-time.
Cost: Free
Dipity is a fun new way to get updates about your friends and topics you care about.
Cost: Free
Allows users to build a customized feed of made up of content your friends on other collaborative sites have shared, including news articles, photos, video and links.
Cost: Free
Plaxo is an online address book and social networking service.