A few of us have been interested in providing this feature on Twitter as part of more general effort in social sentiment (it's just a "is this anything?" project at this point). We see the similarity between 'Retweet' and 'Like' - however, we think the presence of a 'Dislike' would somewhat segregate what a 'Retweet' vs. a 'Like' is for.
You can see the most recent result of efforts in this 30 second YouTube video. It demonstrates where we are with a browser plugin to add 'Like' and 'Dislike' to every tweet viewed on Twitter.com: http://www.youtube.com/watch?v=QlZVBCSXsK8
Would love to hear your thoughts on it.
The more underlying sentiment "gathering and storing" system can be found at: http://upprdwnr.com
You can see the most recent result of efforts in this 30 second YouTube video. It demonstrates where we are with a browser plugin to add 'Like' and 'Dislike' to every tweet viewed on Twitter.com: http://www.youtube.com/watch?v=QlZVBCSXsK8
Would love to hear your thoughts on it.
The more underlying sentiment "gathering and storing" system can be found at: http://upprdwnr.com