Dating site OkCupid's avowed purpose is to "use math to get you dates." Its blog, OkTrends, uses math to make dating fascinating. Blogger Christian Rudder posts only once a month or so, but each item is a wonder, packed with creative analysis and infographics based on data from questionnaires the site uses to match prospective lovebirds. "Don't Be Ugly by Accident!," for instance, looked at photos members uploaded of themselves, the cameras they used and the reactions of other users. If you want folks to think you're a hottie, use a Panasonic Micro Four-Thirds camera and shoot in the late afternoon or late at night. And whatever you do, don't use the flash.