UPDATE

You should be able to login with Twitter now (it worked for me). I just needed to subscribe to one of their free plans ... Sorry I didn't take care of this faster.
Same thing happened to my Twitter app. Easy fix though.
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Did you get a warning though? For me it was an overnight change.
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No warning, just an email that morning about it being suspended.
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Errors in the app : "account is unauthorized"
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