Folksonomy: Social Aggregation and Archiving
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Have trouble keeping up with the sites you visit? Read them in one place with Google Reader, where keeping up with your favorite websites is as easy as checking your email. Stay up to date Google Reader constantly checks your favorite news sites and blogs for new content. Share with your friends Use Google Reader's built-in public page to easily share interesting items with your friends and family.
Outdated social bookmarking web app, easily replaced by Pearltrees. by Aug 31
Tools Google Chrome / Firefox Extension The best way to add web pages, text selections and other findings from within your browser. Browser Bookmarklet