Diigo aims to dramatically improve your online productivity.   Building upon the strengths of award-winning Diigo V3, widely regarded as one of the best and most popular social bookmarking and web annotation services,  Diigo V4.0, has undergone significant further improvements in both the website and toolbar to make Researching, Sharing, and Collaborating faster, easier, and more effective!

Take a guided tour >>

Check out "What's New" in Diigo V4.0 >>

Video Overviews & Tutorials >>

Go ahead, explore and enjoy the power of Diigo!

Note:    the new Diigo V4 HELP  is still under active construction.  

Although there are UI and features changes,  the previous V3 HELP files may be still helpful.  
Enter here to access V3 HELP files >>