Many people I know, when traveling, have a check list of the selfies they want to make to show everyone else how great their life is, when I know it isn't. And they miss the actual fun of experiencing traveling - to them it's just a series of selfies.
This was 99% of my Facebook, and that's why I quit. There was only one guy who was regularly posting interesting articles (tech, space, futurism). I ended up deciding a diamond in a pile of sh#t wasn't worth it, and HN/Reddit are better.
As for the social aspect, most people's lives are boring, and most people are boring, they only look at what's happening today, worry about what other people think of them, and other boring drivel.
/Rant over