Great explanation, thanks for the write up! I have a couple of questions, if I may.

• So if I setup my own instance tomorrow, it'd be sending notifications of activity to all the other instances? Maybe I'd have to have a list of instances I'd like to notify? How does it discover the other instances?

• If my instance is listening to all other instances? Won't saving all posts take up a lot of disk space? I guess there is only text and link data and no media, but wouldn't it add up fast as the number of users/instances grow ?