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Still the easiest way to collect the sites you want to get back to later.
Tags

Tag your collected web pages with relevant terms for easy future retrieval
Personal Library

Your complete online knowledge collection, all in one place.
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Highlight text directly on any web page for personal reference or collaboration.
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Add text, comments or reminders directly on any web page with sticky notes.
Outliner

Structure your research by automated streamlining through Diigo or by your own personal customization.
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Share your research with colleagues, classmates and friends through our collaborative platform for knowledge sharing.
Archived Web Pages

Store your online resources with annotations intact forever, regardless of whether the original source is still active. (Premium Feature)