There is also no good alternative where people could switch from Facebook.
Actually there is. I could've googled "facebook alternatives", but i already know one. It's Vk, russian-ukraininan facebook. You can hit on ladies there, they are often willing to talk.
It doesn't force you to download stupid messegers, which is also and advantage. But, c'mon. We know that people not gonna start moving there when they have all their friends on FB already. Who's going to like their pictures?