redcherry

If you have to pick only one, I think #15 should be it.

Yeah, I read that one here - that's why I decided to repost my question from reddit here on HN...

I've thought of using an FB app, but like you said - last year it would have been great: last year; instead of a quiz, some sort of game that collects the needed info peripherally might work (full disclosures in the game, to lessen the evilness of course)