The Verge writes, Tapbot has released the first beta of Tweetbot for Mac, an important milestone that moves the popular OS X Twitter client closer to an official public release. The latest version includes a number of bug fixes and performance optimizations, but you'll only be able to use the app if your account was authorized for previous alpha builds; Twitter's restrictive new APIs continue to prevent new users from partaking in the beta, and existing users won't be able to add or delete accounts with the client at this stage. Tapbots' cautious approach is the direct result of Twitter's much-maligned new APIs...