Facebook is now at 575 million registrations, not 600 million.
Don't get me wrong, that's massive and impressive and it will be at 600 million soon.
They've reached a level of connection domination that's going to make it increasingly harder to be displaced in their established markets.
http://www.datagenetics.com/blog/december32010/index.html
Their harderst challenge will be to sustain growth, and to do that they are going to have to partner or buy some of the other large (international) players.
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