One of the commenters on that article says: "The idea that anyone should ever need to show ID to use a social network is so fucked up that I find it astonishing that it is a point of discussion." Not really. I recall, in 199x, that a BBS required me to physically mail a copy of my driver's license, along with my payment, before they would give me access. It wasn't an "adult" BBS. I think that the requirement was that I was at least 18, just so that they wouldn't get into trouble over anything that might happen with regard to age minimums. Rather than the exception, the idea of showing ID, to use a social network, used to be considered a normal part of doing business.