There is just way to many social networking sites to keep up anymore. It seems every place is using that model. Even the forum software we use here is moving more and more in that direction with every new version release.
I have an unused myspace, and a rarely used facebook. I have no need to add to the already long list of sites I'm a part of. Does it offer any feature that is really all that important? I'm with the others, I enjoyed my anonymous status... These sites put way to much personal info out there for others to see.