I never understood the reasoning behind this kind of social login. If you're dead set on being an ass, then you'll be one regardless, even if it takes creating a burner Twitter or GH account. Anything short of demanding proof of identity and linking your real name is useless (and now you have two problems.) All this achieves is forcing people to sign up to another service in order to use your own. A low barrier to entry with community moderation is enough to keep the value of the comments high, while keeping noise to a minimum.