I may be ignorant here - but how does exactly bullying on the Internet work? I can understand the harm of being recognized from the Internet video, but you don'

I may be ignorant here - but how does exactly bullying on the Internet work? I can understand the harm of being recognized from the Internet video, but you don't have to reveal your identity on chat-rooms, forums, etc. I imagine on a Facebook and the like, people might request a friendship and then quickly use the platform for abuse and this can render it un-usable. But outside of that - a person is under no pressure of revealing his identity in most situations; in fact most of the internet experience is read-only and a person can choose what to view. Is there something I'm missing? Is it ignorant to imagine that the internet would be a place for refuge for any social outcast, even internet celebrities?