EA have issued the following update via their official Facebook in regards to the server issues the game has been experiencing today, take a look;
Our game servers are currently down. We appreciate your patience as we work to get normal access restored as soon as possible.
Please note that your account, friend list, and town are all saved and will be available once service is restored.
Tapped Out Daily 
Hopefully we’re back soon! I’m hopelessly addicted!
Fix it now!!! This is how you keep players from reaching goals and having to pay for stuff they should have won fair and square.
It’s ridiculous.
This sucks! When are they going to compensate the players for not being able to reacht goals?!?!
I’ve just managed to log back in. Give it a go guys, I think the servers are up and running.
No they’re not up…still only getting the Bart screen, and this has been since this morning.
All the connection problems!!!!! But what’s new. This why I refuse to pay to play. I’ll never be a premium player!
Hear hear…lol
Anyone else not getting the balloon to appear in Krustyland at the balloon stand? I can’t remember the last time I was able to pop 3 balloons.
It’s apparently going to be resolved once the Xmas update is over.