OK Trends is a fascinating read.

OK Cupid has a blog where they share conclusions from their user data- it's pure genius (and a hilarious read). OK Trends will give you all sorts of data based on the answers their userbase provides on the site, which includes really interesting observations. Like one's answer to the question "do you like the taste of beer?" is apparently an indicator of whether or not a girl will sleep with you on a first date.