Paul Haddad of Tapbots:
We’ve been working with Twitter over the last few days to try to work around this limit for the duration of the beta but have been unable to come up with solution that was acceptable to them. Because of this we’ve decided its best for us to pull the alpha. …
Just to be perfectly clear, Tweetbot for Mac will still be available for sale in the near future, we are just stopping the public part of the alpha/beta testing.
Just another example of the mess that is Twitter right now..