tweetCC
tweetCC started as a conversation on Twitter between Andy Clarke and Brian Suda. Andy wanted tweets and avatars for a new book. His publisher needed him to get permissions to republish and that meant asking everyone. This was, not to put too fine a point on it, a pain. Brian agreed.
It would be nice if twitter could allow for a CC or other license on your content, then people don't have to ask.
Twitter is clear that they make no intellectual claims over your tweets. "We claim no intellectual property rights over the material you provide. Your profile and materials uploaded remain yours." Twitter also […] "encourages users to contribute their creations to the public domain or consider progressive licensing terms."
But what about the people who want to reproduce your tweets? With no tweet license policy, republishing them without asking is a bit of a grey area.
tweetCC makes it easy for you to offer your tweets (and your avatars too if you like) under a Creative Commons Public Domain Dedication license. Anyone wanting to reproduce tweets can then do so without asking you.