Diigo (DEE-go) is a Social bookmarking website which allows signed users to bookmark and tag web-pages. More exclusively, it allows users to highlight any part of a webpage and attach sticky notes to specific highlights or to a whole page. These annotations can be kept private, shared with a group within Diigo or a special link forwarded to someone else. The name “Diigo” is an abbreviation for “Digest of Internet Information, Groups and Other stuff”.

The launch of Diigo met with mixed responses from the unimpressed  to the enthusiastic. Diigo beta was listed as one of the top 10 research tools by CNET in 2006..

Outside the website, Diigo’s graphical user interface includes an optional bookmarklet, or a customizable toolbar, with various search capabilities. Highlight is enabled by a menu, that can either appear automatically when content is selected, or be embedded into the Context menu.

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