I looked through it and it's very robust. I should have a few data visualizations up using it soon.
It's a dating site.
I really wish there was a checkbox at the end of a registration form that said something like "Show Publicly". I'd wager most people would leave it unchecked.
Sure, you can't control what randoms on the Internet might look at your public profile, but you can't control who signs up for OKC accounts and looks at your private one, either.