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”.
Diigo provides rich tagging capability as well as folders for better information organization, and group annotation for better collaboration. Diigo automatically caches the page so it is always available to you. Diigo allows you to search the full-text of your collections, or just within your highlights. Diigo allows you to easily extract your research findings or publish them to blogs