Facebook is used by 3B people.

When a company (or even more generally a social phenomenon) is so big, the only logical consequence is that it becomes embedded in the layer that it services.

In society not everybody is equal, a social movement with the massive scope that Facebook has cannot deviate from such rule.

Power law is a thing, you can't escape it, not even the Universe can.

It's not right and it's not wrong. It just is.