Regarding Facebook, it doesn't surprise me, for a simple reason: they're one of very few companies that people feel like they have to use it, for fear of being left out socially¹, so disgruntled users will tend to feel worse and worse about it.

It doesn't necessarily mean more people dislike FB, just that the ones who do learn to really hate it by prolonged usage.

¹I'm not saying I agree with this view, just that it's common.