Facebook began as an exclusive social network for upper-class students. Gradually it grew to encompass not just all of America, but the entire world. It turns out, many of us well educated people don't really want to network or socialize with poorly educated people. Police started monitoring our activities, so the events all but disappeared.
The world changed, too. Facts used to matter; we read books and the newspaper, not 25 reasons to be an idiot on Buzzfeed. Truth used to matter; less of the nation was as polarized. It was easier to get along without people shoving their ignorant political ideas in your face. Then 2016 happened, with the Russian trolls and other psyops used against us, and some of us realized we'd fucked up by buying into and encouraging others to join this network and others like it.
I could probably go on for a lot longer, but that's the gist of it.