Facebook has the right to control their content at their discretion. You have the right to use or not use their services at your discretion. Case in point. I value my privacy and I don't really want to connect with 200 people in my life on an artificial level. Therefore, I don't have a Facebook account....but Facebook is a private site, it's impossible for them to engage in Censorship with a capital 'C'! They have no obligation to provide transparency or "freeze peach" to their users, right? Should Facebook disclose content restrictions? Should users of social media value platforms that respect transparency and free speech?
I have a Facebook profile and was fairly active from 2005-2008, although I don't use it anymore and I also use NoScript to block Facebook tracking. As a netizen, I've come to expect that I have no "rights" on any website that isn't hosted on my own property. It does worry me, considering the concentrated private power certain internet companies are developing, although I suppose it's not too much different than the power meat-space companies have had for generations.