Much like Facebook, dating site OkCupid has been conducting secret social experiments on its users—not to influence their moods, but sometimes to influence their opinions of one another. In the latest post on OkCupid's data-driven chronicle of man's inhumanity to man, the OkTrends Blog, we learn that your picture is all that matters and you'll like whomever a fair-to-middling cupid tells you to like.