AllThingsD has some detail behind a Twitter update of its “discover” function it uses to recommend users to follow. It sounds like Twitter is looking at posts of interest to people a user follows. While that makes sense, as described it sounds more like a social graph rather than an interest graph. Haven’t we all been saying Twitter’s in the best position to map actual interests? Right now it’s recommending some tech, football and business stories for me, though none of them are particularly surprising. And its entertainment recommendations do touch on movies, but also TMZ celebrity news that I couldn’t care less about. Survey sample of one, of course. But I use lists that actually have topic headers, so you’d think Twitter could figure me out. Keep an eye out for some new research from us on content discovery, and be sure to come to paidContent 2012 in my neighborhood.