I just saw this posted in the EA Answer HQ
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eadennis
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The Simpsons: Tapped Out Server Issues: 11/12/13
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?11-12-2013 04:57 PM
We are aware that some players are currently experiencing difficulties accessing the game. If you have found yourself logged out of your account when you enter the game, your device has automatically logged you out. Youll be able to sign into your account, and resume your game progress once the issues have been resolved.
Players who are able to access their accounts may not be able to change their accounts or create new ones. Additionally, they may be unable to visit/see their friends towns. These features will return once the issues are resolved.
Please note that your account, friend list, and towns are all saved and will be available once full features are brought back up.
Thanks for your patience. We will provide an update within the next few hours."
Here's the link if anyone wants to check back in the next few hours...hope this works...
http://answers.ea.com/t5/The-Simpsons-Tapped-Out/bd-p/The-Simpsons-Tapped-Out