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