What I've noticed is that if I do not touch facebook for a month, when I come back ALL I see are personal mostly text, sometimes photos posts from people doing actual updates of their lives. Gone is the absolute DELUGE of clickspam, shared political links, quick videos and ads.
But spend more than a day on it and it all comes back. Its /r/all or imgur. Its unusable again for the prime reason I have a facebook account, keeping up with friends and family.
My suspicion is that since their feed algorithm tracks how long you look over things, and HIGHLY prefers videos and click links over text or photos. If you spend a few more seconds over a gif thats pretty much designed to grab your attention than grandma's witty comment about the old days you're doomed to never see grandma again, unless you comment, like or otherwise engage with the grandma post in a metric-capturable way.
This is the problem with social media - the more you try to monetize it via advertising the less you succeed at your core value proposition. If not for the network effect I suspect people would have moved on a long time ago.