Since modern philosophy has been teaching that reality is a social construct, why wouldn't it follow that each individual self is too? Further, we have been taught that values are socially determined (market prices, fashion, popular arts, ...) and that for the individual the highest moral compass resides in the well-being of others (e.g. utilitarianism, charity drives, altruism, welfare programs, ...). Given this, wo…
You mention that notion that reality is a social construct. This makes me think of Jean Baudrillard[1] and his assertion that the Gulf War I did not occur, it was simply a television show that we all watched.
Baudrillard would obviously assert that Facebook is part of the Simulacra. (I don't think anyone can doubt that, so I'm not qualifying the sentence.) If one is trying to get back to something real, the path does not lead through Facebook. If one is trying to find real connections with other human beings, the path does not lead through Facebook.