I think people leaving facebook en masse would be a good thing (TM) for society, not a doomsday. Fewer echo chambers, less disinformation, and people forced to make effort to contact each other.
Some might claim they get downvoted because they are "low quality" to which I'd retort why spend a lot of time crafting a "quality" reply when you know it's going to be suppressed?
I even tagged you as 'shitty commenter', which I don't do this too often. But with some commenters I'm just amazed at how they can consistently keep this up without tiring of it.
Media sucks because you* suck.
*The collective societal you, not the particular individual you.