The pivot of Facebook from "here's a way to connect with family and friends" to "here's a steady drip of 'engaging' content made to generate 'likes'" is very interesting.
Propaganda is endemic, nobody is immune, it's the matrix around us. Self selecting echo chambers with the brand of propaganda containing the message they like best, and if they don't like it, switch to another brand. DRINK MORE OVALTINE!
I wouldn’t put too much stock into it. Facebook does so much stuff, everyone uses it for different reasons. Like me, I use it for the marketplace nowadays, and for events. Some people like groups, some like meme pages