English Chess Forum

Via the Guardian: you can play chess against one of your Facebook friends using the Messenger app. Send the message '@fbchess play' and a board appears. You enter moves by typing them.

Fortunately there doesn't seem to be an engine attached, so the possibilities for using this to cheat seem limited.

This has been around for a few months. I abandoned it when my most recent game wouldn't let me capture en passant, and I had to else I was stuffed...