Social Bookmarking

Hmmm ... not yet sure of Diigo is useful for me at the immediate time.  I understand the functionality of it but don't see a purpose for me.  I could see how it beneficial if/when I do research, esp in a collaborative setting.  I also see the benefit of having your bookmarked sites available from any computer and not simply on your home/office computer.  I also like that not only can you bookmark a site but that you can also highlight, add text/comments, etc.  Much more meaningful way of researching online.