Tweetbot is not an Autobot, but it has maximized into a larger, desktop-ier version of itself, called Tweetbot for Mac. That’s the same Tweetbot flavour we love on the iPhone and on the iPad, but in a package that’s more appropriate for use on your Mac.
The only thing to warn you about is that this is not a final release (it is, in fact, a super pre-release). The devs at Tapbots have decided to release a public alpha version of the software so that they can benefit from a larger testing pool, and we can benefit from early hands-on time. So do expect and report bugs (Help menu -> Send feedback), but otherwise…maximize.