It would be cool if we could send a text message to a neighbor's city via a special airmail plane.
If you give tools to do something, you can be certain they'll be abused by someone. If you provide huge editable spaces, the next day there'll be links all over to child's porn or illegal drug sales, or whatever that is illegal and could lead to the game being a considered a hub for such kind of activity by law enforcement agencies. To counter this, you can either have a huge support/moderator team to clean this 24/7 or you just don't get into it because you don't have the kind of budget Facebook has.