Are you unable to log in to Twitter this morning? If so, it’s probably due to a recent update to the Twitter API.
As of August 31st, applications which access Twitter need to use the OAuth protocol. This means that if your application is using the old authentication method and hasn’t been updated, you won’t be able to log in.
According to Twiiter, there are some 250,000 applications which access Twitter, so expect some disruption as they all move to OAuth!