I hvaent tried any of them out yet..
but Ive heard php-fox and Dolphin are 2 very good options..

http://www.best-php-scripts.com/social_networking.htm

Hmmm... IDK

I need to try some of these out

This is never something I really looke dinto for my own use, but I think a friend of mine might be interested. Thanks for sharing the link

I think Dolphin rings a bell, though im not sure if thats a good or bad thing

Try to choose a better social networking site. Try to choose in much more popular site like Facebook, Myspace and etc.

FB is a good marketing tool, absolutely.. but this is talking about the software that social networking sites run..