Teamgum : Collaboration Tool for teams to share, access and discuss efficiently using browser extension and mobile app.
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Hot Bookmarks | Diigo
bookmarking done right: historious, your personal search engine - historious
Internet Archive: Bookmarks
Clipmarks - Connecting people with information.
3spots: ALL Social that CAN bookmark • • •
Listible! Quick way to get resources
35 Resources on Social Bookmarking Sites - Listible!
Shadows - Tag, comment, and rate your favorite web pages.