Whoever cropped the source out of this screenshot is mean and dumb.

Screenshot of the tweet posted by OP, but unlike the one posted above this screenshot includes the poster's user info. Tweet by Billy Cove, username @cove_billy, which reads, "Why do Porn sites have a 'share to Facebook' button? Dunno about you, but I've never watched porn and thought, fuck me, I reckon uncle Steve, aunty Steph, and my old Geography teacher would fucking love this!!"