Auto-tweet from Salesforce



Is auto tweet possible from salesforce?
Let’s say some user ‘XYZ’ posts about my website on twitter. I would be able to create a lead on Salesforce using Radian6.
But, is it possible to retweet to his post(a tweet mentioning his username)? If yes, how do I do it? Any documentation on this?
Help would be greatly appreciated.

Thank You