As a publishing forum, I agree that a real name policy has little effect. Sadly, I rarely see people use social network sites as a publishing forum, and more like a social space to hang around at. Its like a bar. technically, a bar is for drinking, but if bars only purpose was drinking, few would go there. An other example would be to compare Google+ and BBC opinion section. Both are technically the same thing, an publication forum. But beyond the technical viewpoint, they share nothing in common. If BBC opinion section would have a real name policy, I would not care that much.