Self-censorship is a cornerstone of human social behavior. Even if I think you're a complete asshole, it's often neither necessary nor appropriate for me to say

Self-censorship is a cornerstone of human social behavior. Even if I think you're a complete asshole, it's often neither necessary nor appropriate for me to say that, or even hint at it. More or less all of us do this. it's called choosing one's words. Facebook is another modality of human speech. At first, we spoke and things lived in the minds of listeners alone, or to those to whom the words were related. Then, with writing, we could record words durably, and any who could read and had access to the text could know what we say. Now what we say is durable and trivially disseminated to thousands, perhaps millions. By all means, speak your mind. But consider first if you want what you have to said known by all possible recipients of the speech, and if you're wiling to deal with all consequences thereof. Edit: none of which is to say that forcing people to divulge passwords for or the content of social media for employment purposes is remotely ok. It's not.