1) People hate Facebook in the same way I hate cheesecake: Facebook does such a good job at hooking me in and spending so much time reading content that it's a delicious evil. I hate how cheesecake makes it so irresistible and would like to eat less of it, but that doesn't make cheesecake bad per se. =)
2) Not everyone does hate Facebook, it's just the Yelp effect: you're more likely to hear about how someone hating on something MUCH MORE than you are likely to hear about someone loving (hell, even just _liking_) a product/service/etc. My buddies and I connect on FB messenger all the time and find it convenient, but we're not going to rave about it on all comment boards, Reddit, etc.
(Sidebar: I find that it's more of the exception, rather than the rule, when the Yelp effect is broken. For example, Evernote made a killing off primarily word of mouth in its early development, and people rave about it everywhere.)
This is complete and utter nonsense.
People would not be using the site if they did.
My dad hates facebook, but he uses it because there's some family and friends on there that make him feel obligated to stick around.
Breaking away is easier than it seems at first, but there are plenty of people who dislike facebook who still use it.
Is this happening only here in Germany? I was definitely surprised to be back in "the mainstream".