Don't like or cannot install toolbar?  That's ok.  Diigolet (a bookmarklet) is a perfect alternative!   Click here to access.
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Although Diigolet is not as feature-rich as the Diigo toolbar, it can be set-up by simple drag-and-drop. There is no download or installation needed, and it works for all major browsers (including Chrome!)

Diigolet is not just merely another typical bookmarklet:  besides simple bookmarking, it also allows you to highlight, mark up webpages with sticky notes, and share the bookmark to a group!

See Diigolet in action: