Don't like or cannot install toolbar? That's ok. Diigolet (a bookmarklet) is a perfect alternative! Click here to access.
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: