I subscribed to the NY Times and Washington Post. I re-bookmarked sites like Anandtech and Ars for periodic visits. I changed how I use services like Google at the same time. It's a whole other issue, but just the long contemplation about this had me switch from my GS8 to what was my development iPhone 8 as my daily driver.
I know I'm just one person, but quite a few people have made similar proclamations, and among peers I know several just finally abandoned the site (the whole fake news things already starting the flow). These sorts of periodic issues just blend away when a site is on a dramatic growth curve and it just gets drowned out, but Facebook had essentially peaked, so they're really in a position to only lose users.