Does the Diigolet not display the tag dictionary? I'm an education user, so I'll pretty much be limited to the Diigolet, not the toolbar. Am I out of luck?

In a group, how can you follow (easily) the history of a page (within that group?) I've seen a few references to it in the community, but does anyone have any hints for me? It's really important for me to see how the bookmarking of a page changes across time (but within the group.) It seems like if a user doesn't enter a description, on the group page it's impossible to tell the history of marking?