Maybe I should know this by now, but there is one thing I don't understand about the #Fediverse:
What is the difference between all the services (e.g. between #Mastodon and #PixelFed). Obviously PixelFed is for images and thus has an accordingly catered UI, but does the server also need to give special consideration to images? Isn't everything #ActivityPub? Does each service have to extend AP to support its type of content?