A colleague sent me this great list of White Label Social Networking Platforms from TechCrunch. The original list they created reviewed 9 popular platforms including Kickapps, Me.com and Ning... a recent updated list includes an additional 28 Social Platforms including a few that I am familiar with: Leverage Software and LiveWorld. I really like these kinds of side-by-side comparisons of features and functionality because it allows those of us who are thinking of leveraging these platforms in any significant way to see the basics. Over the next few months I am going to be diving into these platforms, trying them myself, talking with as many of the companies as possible and reporting back on my findings.
There are probably a few significant platforms that are not on this list. If you know of any - please let me know!