It's a free country and I would never shout at people simply because they're "on Facebook." Some people send their kids to private schools. Some jump the queue by paying for private medicine. Some enjoy Wagner's music even though he was rabid antisemite. I haven't checked the ethical failings of the banks which have my savings. I eat crumpets made by a company that donates to the Tories. For me, the extensive harm that Facebook does is in plain sight and it's just a bridge too far for me. Life was fine without it and still is for me. That's all.