Well, this is a big win for build-your-own-social-network Ning, which just raised a massive round of funding. The new Playboy social network we covered earlier today is actually built on Ning, not self-built code or one of the many other white label social networking options available.
Once you actually sign up for the site it becomes clear it’s Ning, since their pervasive toolbar remains at the top of the site. Users actually use their Ning address to log in. You must have a .edu address to get an invitation, but you can then sign up using any Ning account.
Whether or not this network is successful, it’s great validation for Ning.