I don't see the irony. How is it "socially-anemic"? It is in my opinion obviously much more social to talk to somebody on the phone than to post something on Facebook. Even 1-to-1 chat as you mention is much more social (but loses an insane amount of nuance and emotion), but still much less so than a phone call (but I also chat of course).

Or do you consider everything that is not face-to-face "socially-anemic"? Are you saying that conversations via chat are deeper than on the phone?

With a Facebook post one is essentially just dumping a complete story on the masses for them to consume. It's not personalized and people cannot interact by asking questions in between, or by adding their own stories ("Oh, I loved that part of the movie! Did you also think it has a deeper meaning to it?", essentially steering the conversation into another direction), or show you that they don't want to hear about something, for example.