Another idea for a federated service. Shopping network. Each account is a possible seller and/or buyer. Each instance is a shop. Anybody can search for goods on any instance. Buyers can follow sellers for goods updates. Buyers could follow other buyers for goods reviews.
@lig I don;t use facebook but something like facebook market place for Mastodon and other federated services.
@zleap well, nothing stops anybody from selling anything using any media platform. I suggest a tool that provides additional data structures and a specialized UX.