Technically, Twitter says you keep the right to your words.
If you wanted to give up the rights to your words, you could use something like tweetCC (http://tweetcc.com/) to apply a Creative Commons license to your tweets.
If you wanted to give up the rights to your words, you could use something like tweetCC (http://tweetcc.com/) to apply a Creative Commons license to your tweets.
Whether you can copyright text as short as 140 characters is at least debatable-- it may be that nobody holds copyright over tweets.
Jobenjo has a point about haiku -- but questions will seldom be recognized as poetry.
Indeed, as a question gets better as a question, more concise and precise, it becomes more like a pure idea, or a strictly functional communicative construct. You can't assert a copyright on those.