I agree that cross-instance communication is very difficult. There should be a special URL scheme that points you to your instance which is installed as a handl

I agree that cross-instance communication is very difficult. There should be a special URL scheme that points you to your instance which is installed as a handler. Perhaps something like activitypub://another-instance.rocks/contenturl Also, cross-instance search and discovery is difficult. There is no global index for topics which you can follow. Perhaps DHT or Gnutella can serve as inspiration.