Twitter doesn't give you copyright on anything. They just license content that you already own copyright to.
I disagree that repurposing tweets is wrong. Many twitter-based barnacle applications do just that and no one raises a stink.
And Mahalo Answers doesn't remove attribution. They link to the twitter account that posted the question (http://twitter.com/fluther) on the page. This might not be the attribution you desire (and you might be able to pursue legal action), but the attribution is there, nonetheless.
True, isn't there a difference between the tweets shown by, say, http://cursebird.com (which are clearly tweets), and repackaging a tweet as a different form of content.
If they maintained the integrity of the tweets -- complete with the links present in them, that's something else.
I disagree that repurposing tweets is wrong. Many twitter-based barnacle applications do just that and no one raises a stink.
And Mahalo Answers doesn't remove attribution. They link to the twitter account that posted the question (http://twitter.com/fluther) on the page. This might not be the attribution you desire (and you might be able to pursue legal action), but the attribution is there, nonetheless.