It's interesting how the natural inclination of the folks drawn to this kind of product leads to them being willing to provide a lot more personal information than they otherwise would to other similar platforms.

I'm not 100% sure on that. I saw a lot of 'non-badged' accounts, meaning they weren't providing much info. I guess, though, presumably many (most?) were providing real phone numbers, but Twitter tries to force that from people, so perhaps not much more than Twitter?