It’s taken a little while but Twitter has jumped on the bandwagon and launched an official “tweet” button for your social icon set. Twitter made the announcement yesterday on their official blog. While this is not the first “tweet” button made available, it is the first official button put out by Twitter directly.
You can use the tweet button builder to create the look that best suits your needs. Placement on your site is as simply as pasting a few lines of JavaScript code. For advanced users you can also build your own custom button from scratch.
When users click the “tweet” button a small “tweet box” will appear for you to log in, followed by a pre-filled field with a basic tweet and link which you can edit.