On most radars, Facebook wasn’t going to make the political news this week. But it is, and twice. We’ll start with the wingnut, bat-guano crazy and move on to the counterintuitive defense of a public figure by a social network executive. Nothing like some anticlimactic structure to start your weekend, eh? But there’s surely enough in the beginning to last you: Impeach Obama groups are already appearing on Facebook. Sigh. Two things: