"His server sends a notification to every server following him or mentioned in the post with permission to see the post."

The protocol seems to have some fundamental limitations.

For my money I'd rather go with FETHR (see http://dsandler.org/brdfdr/ and this paper: http://dsandler.org/brdfdr/doc/iptps-fethr/) and its implementation - which has code available right now (https://bitbucket.org/dsandler/brdfdr/).