> I think I sort of assumed that if it could be turned off, pretty much everyone would
There's no incentive for me, as a college derp, to turn it off - after all, it's not impacting my experience on Facebook. Sure, everyone else's feeds are annoying, but it's like a mix of the prisoner's dilemma and the tragedy of the commons.
Not to mention, you can hide truly annoying feeds - but again, most people don't care.
My solution is no longer visiting Facebook. I keep my account because it's still the least inconvenient way to plan events.
