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Amid concerns from Mac users, Tweetie developer Atebits responded on the MacHeist forums today:
"Hey all - first of all I apologize for any confusion, things have been a bit crazy! I just want to says I'm blasting through the todo list to get a beta put together as fast as I can, the Mac UI stuff I've been prototyping is just too cool to have anything else happen to it. Sorry for keeping it short, gotta get back to coding!"