Same here... They are obviously having server problems... It usually doesn't last too long... If ur really pressed... Sometimes if u delete the game and reinstall, it will connect you to a working friends server... But in my opinion... Be patient...
Last night while visiting friends, mine crashed too. When I reopened the app the only friend I had was other Springfield. I gave up yesterday and tried again today and it worked just fine. Give it another day as Macjiggles said and it may be fix itself.
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That seems to be the same for me, the ones who have heavily decorated towns seem to either crash or take a very long time to load