Facebook can do that because people in general defend the most dangerous superstition - the belief in authority.
Without that, "fb weaponry" wouldn't matter.
And it isn't specific to fb. It's across all media that is proprietary. YouTube, Google, Twitter, ect. Facebook is simply the one where it happens most often.
It sure is. Problem is, most people defend what is powering that threat. In all likelihood, you do too. What is powering the threat is the common belief in authority.