Chipmark :Another basic social bookmarking site.
Citeulike : A free service to help academics to share, store, and organise the academic papers they are reading.
Claimid : Manage your online identity. Although this is not a normal social bookmarking site, users can bookmark sites which reference their identity and build backlinks in this fashion
Clipclip : Clipclip allows you to save images and text, with a “bookmarklet”
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