Delicious

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Delicious is a social bookmarks manager. It allows you to easily add sites you like to your personal collection of links, to categorize those sites with keywords, and to share your collection not only between your own browsers and machines, but also with others.=====

__What is Diigo?__
Diigo 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.

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