Person A: Sunny days are good.
Person B: If all days were sunny, we'd never have rain, and without rain, we'd have famine and death. Therefore, you are wrong.
Problem: B has misrepresented A's claim by falsely suggesting that A claimed that only sunny days are good, and then B refuted the misrepresented version of the claim, rather than refuting A's original assertion.
The benefits of social networks are self evident - they enable communication in an unprecedented way. His argument is that the drawbacks he is talking about are unnecessary and dangerous and that some of the technology may seem useful, but is actually just thinly disguised non-social behavior ("keeping up" with somebody may border on "stalking"). You have not addressed any of his arguments while complaining that he didn't address points that nobody was discussing to begin with.
So yes, one more, final, time - your argument is a straw man.