Well, not really a security related post but just found out that you can play chess in Facebook Messenger..
You just need to load Messenger and click on a person and type @fbchess. You will get a chess board come up and to make a move you need to just type
You need to say which piece you are moving P for pawn, N knight, B bishop, C castle, Q queen, K king.
So for Example to move my King to d7 i would type
Have fun and enjoy!