GEE, I WONDER WHY? When Craigslist comes to town, HIV infections go up, study says. “We argue that the introduction of Craigslist provides users with the ability to locate and socialize with specific groups of individuals who are inclined to engage in casual sex but are otherwise hard to locate in one’s day-to-day life and community.” Which groups might those be?

Related: Gay Dating Apps Become Messengers for Warnings on HIV. Heh. “Dating.” Anyway, why the apps for male homosexuals and not any others? We all know, but it’s impolite to say.