Board Thread:Tapped Out Help/@comment-75.95.29.86-20131212153608/@comment-24298678-20140205223910

on iOS devices, I am fairly certain that when you click the "Visit Other Springfields" button, and the list of your friends appear, there is a button in the top left to manage friends.

on Android devices, this option is unavailable. Instead, you must log into Origin, manually enter the Origin Usernames into the Block Users box, return to Tapped Out, log out, and log back in.

Hope this helps to clarify.