The re-tweet button on Twitter itself is initially available for a small group of users to see how it goes in practice. If all goes well, the button will be progressively rolled out for all twitter users. If you belong to this group you see the following message after logging in, on the homepage of Twitter, :
“New! Re-tweet to share tweets (BETA). Hi there, you’re part of a beta group receiving this feature, which means you may start seeing re-tweets in a new way. People who do not have this yet will see your re-tweets prefaced by “RT”.
Then when you see your mouse on a tweet is a stand Re-tweet button appear next to the Reply button.
After pressing the button will be asked to confirm in the tweet and you see how many other users have gere-tweet the message.
On your own Twitter re-tweet this page is provided with an icon for the message below also how many people have repeated the message.
If you don’t want to re-tweet of if you re-tweeted the wrong post, then you can reverse the same through the same button. I’ve also written a Twitter guide (presentation) on how to use twitter, make sure you read it, if you’re new to the twitter world :) …