"Tweeting, inverted".

From my knowledge of twitter (have NEVER used it), it allows one person or entity to publish messages for everyone to see.

What if several people want to publish messages TO someone or some entity (like a company), and want them to be seen publicly? You create a channel for that entity on tweet.in and tweet your message into the channel. Others will be free to join in. It'll be like one of those public boards where you can leave messages on particular topics.

So, for example, you'll have messages for the Iranian leaders, condolence messages for MJ, product feedback on Vista, etc.