I'm another data point of overusing Facebook then deleting it entirely, after downloading all my stuff for archival purposes. I quit Twitter as well. Really, the only social networks I use today are a couple of old chatboards I've been on for years, LinkedIn rarely, and HN.

One realizes after a while that most of these platforms, while seemingly benevolent and innocuous, actually thrive on turmoil and strife.

You are not the customer; you are the product. Turn these things off and starve the beast. There's a place for social media and online discussion, but it has to be used judiciously. Don't let it take over your life.