You can now challenge someone to game of #chess over toots! https://castling.club/ 💪
It's actually a standalone server in the #fediverse, implementing #activitypub all by itself. 😃
Server run by the main developers of the project 
It is not focused on any particular niche interest - everyone is welcome as long as you follow our code of conduct!
@aeb No, but I’m considering open sourcing it! Just sitting on that decision for a bit. 😀