Knowall

This is great. I've been noodling on this type of idea for a while but glad to see someone implement a nicer version of it :)

I really like it. Perhaps discovery could be the next step? I'd love to be able to offer book suggestions to people I don't know on topics which I'm slightly more qualified in, for instance. That does obviously detract from the friends-only attractiveness of it, though. Maybe I just need to get some better read friends!