What are some Social Networking Site's?

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What are some Social Networking Site's?

I'm looking for some new Social Networking Site's Other Then Myspace,Tagged,BlackPlanet,Etc. Can somebody please tell me any other one's because myspace is kinda getting really old to me and boring. So is there any other one's as large as Myspace for teens such as my self? It would be great if everyone can name at least 3 of them when they answer. Thank You =)