Diigo (dee'go) is a free online social bookmarking and annotation service. It offers an integrated, simple-to-use platform to let you easily annotate, bookmark, share and discover online contents.
In addition to allowing the tagging and sharing of bookmarks, Diigo provides the following features (most of them are unique to Diigo as of now - we think )
- Adding sticky notes and highlights
- Forwarding of multiple annotated pages
- Everything can have either public or private settings
- Public notes and highlights are seen by visitors of the web page if they also have the Diigo toolbar
- Advanced search for tags, titles, highlights, notes, and text.
- ... and some more.
