Assumes facts not in evidence.
"But what if I don't get to know what that girl I vaguely knew in English class 30 years ago had for breakfast?" listen to yourself. Social media is a badly gamified, thin gruel substitute for actual conversation and everyone knows it. Besides which you're assuming that a top-down infrastructure is the only way this works - when fuckin' blogchains did a better job anyway. 'member back when you didn't need to know who someone voted for to be friends with them, you just needed to share an interest in z-gauge Marklin trains? Pepperidge Farm remembers.
Study after study after study after study after study supports the fundamental truth that social media makes people less happy, not more. If I could change my enameling and watchmaking groups for alt.rec.watchmaking.humor or whatever I'd do it in an instant. The fact that the killer productivity app is basically IRC for $40/seat says some shit, namely that the minute we traded Mosaic for Netscape we were fucked.