Click here to install TwitterBar from the Google Chrome Extensions Gallery.
(You'll need to be running the developer builds that support installing extensions; Google Chrome from Mac does not yet fully support extensions.)

After you've installed it, just click on the Twitter icon in the toolbar bar, type your message, and press Enter to post your message to Twitter. (You'll have to authorize TwitterBar the first time you tweet, but it only takes a second.)

If your message gets too long (Twitter only allows 140 characters), the happy blue Twitter bird will turn into an angry red Twitter cardinal.

Thanks for trying TwitterBar! -- @cfinke

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If you're a fan of TwitterBar and would like to promote it on your website, you can embed the widget below on your blog by clicking on the "Embed this Widget" link.