I am literally the only person I know of my age who doesn't use Instagram (and unfortunately, I'm not hyperbolizing), which pretty much completely alienates me from my generation. It'a virus.
I can't even stomach the site. Posts are either selfies with shitty 'filters' to make them look pretty or prehistoric reposts of a relatable pic or an edgy video, any of these almost completely covered with watermarks nobody cares about.
Of the social networks, I use only IMGFlip, YouTube and 4chan (Messenger is for contacting and information-sharing purposes only). I really don't need anything else.