I want to recommend you http://www.bestdatingscript.com As this is not a social community builder but a dating script. But also you can buy the total script with source code .
Umm, no, I would not go with that. What do you guys think about OpenSocial? it seems like it will change the whole way we build communities.
http://www.vbulletin.com/forum/showthread.php?t=249460 Lot's of new cool stuff in this version. Now anyone can create a myspace/bebo/friendster with just a vb license.