– Notifying contacts that you are leaving Facebook
– Blocking content from particular federated servers
– Blocking objectionable material from Facebook that it allows, but your network does not
– Posting material that Facebook prohibits
What excites me about the world that Doctorow imagines in this paper is the control and nuance over such things as feeds. Personally, I would be just grateful to be able to follow updates from sites such as Facebook, Instagram and Linkedin via a feed, rather than having to log in.