When playing Bingo Pop for the first time as a Guest, a random username will be generated and assigned to your account (e.g., SmoothDauby01).
Having a unique username helps with differentiating other Guest players. This comes especially helpful when trading or sending Gifts.
Currently, Guest usernames cannot be changed. However. when you save your game progress with Facebook, your username will be updated to use your Facebook name (e.g., John S.). Your last name will not appear in full.