I wrote a post earlier this month — Jump Knowledge — about an online application that allows you to “write” on webpages, and then share what you have written with others. I spoke about having my students use that to identify their favorite links on my website.
I’ve recently learned about another similar application called Fleck.
There doesn’t appear to be much difference between the two, but Fleck might be a tiny bit easier to use.
You can find both of these applications, as well as other more typical Bookmark programs, on my Examples of Student Work page under Student Bookmarks.