I had a friend like that. She started off in a good place. She then got sick with something and went on disability. Being online became her world. She ended up like your friend taking things way too seriously. She would visit other people’s blogs and post caustic comments. She would also post politically obnoxious things on Facebook. I told her that behavior wasn’t good for her and would cost her her friends. She wrote back and said that she didn’t care. She was a rageaholic.