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Diigo - Web Highlighter and Sticky Notes, Online Bookmarking and Annotation, Personal Learning Network.

NewsBlur

Discover, Blink & Share

Xmarks | Bookmark Sync and Search

Technorati

StumbleUpon.com: Personalized Recommendations to Help You Discover the Best of the Web

Bloglines

Costa (makethemost) - Profile

Sample Profile

Yahoo! Bookmarks

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Reader

reddit: the voice of the internet -- news before it happens