Using Tweet Button couldn't be more simple: install the extension and click on the little bird that appears to the right of the address bar. You'll be asked to authorize the add-on to tweet in your name, and once that's done, simply hit the icon again to tweet the page you're on. With Tweet Button, you can do this directly, without going via the Twitter website.
To make things simpler, Tweet Button also automatically shortens URLs and offers statistics on the links you have tweeted. Although Tweet Button is very short on extras and configuration options, it's a solid, useful way of adding more Twitter functionality to Chrome.
Tweet Button's a practical Twitter extension that really adds value to Chrome.