> Twitter has no mechanisms for this. Every user floats by themselves, interacting with who they please. This denies us the ability to build communities, to set social norms, and to enforce them. Twitter has absolutely no way for me to share with others that someone isn't a person I want in my communities

I read this and said "oh, he wants to censor people." Then, I got to the bottom of the post and saw that he doesn't allow comments either. It was a one, two punch.