Kickapps Seems like the best one for COMPONANT integration

COMPONANT or API based integration into existing site.. Thats sounds nice.

clipped from www.techcrunch.com We have taken a sample of nine of these companies – Ning, KickApps, CrowdVine, GoingOn, CollectiveX, Me.com, PeopleAggregator, Haystack, and ONEsite – all of which provide free baseline services, and reviewed them individually below. We have also included the chart on the right summarizing all of these companies’ offerings. Credit for initial research into these companies goes to Jeremiah Owyang who compiled a comprehensive list of white label social networking services. 9 Ways to Build Your Own Social Network