offers one of the most feature-rich and robust social bookmarking / web annotation services on the web today. Via Diigo's "Twitter-this" feature, you can easily share interesting websites or content on Twitter with a shortened URL - from the page you're visiting. It also allows you to easily add highlights and sticky notes to any webpage, and then share the annotated page with your Twitter followers. They will just see an ordinary link in the twitter message; but when click the link, they can also see your

Tool Reviews

Reviewed on October 7, 2010

A better tool then delicious. No idea why is it less popular.