Social bookmarking allows people to share the sites that they have come across and found useful or interesting, a networking way of promoting interaction and collaboration in the classroom. Two popular tools for social bookmarking are Furl and del.icio.us.The main difference between the two, according to Will Richardson, is, "Whereas Furl is about saving content, del.icio.us is all about sharing links in as easy a way as possible." One other recent tool is H20, a bookmarking site designed by the Harvard Law School. Read Ewan McIntosh's comments on "H20: Tagging for Academia", in which he points out its advantages over del.icio.us for classroom purposes.

For a brief introduction into social bookmarking, its uses, and various bookmarking tools, read "Social Bookmarking Tool Comparison" at ConsultantsCommon.Org. For sources specifically on using Furl and del.icio.us, Jim Wenzloff has a guide for using Furl (pdf); beerlerspace has "Us.ef.ul, a beginner's guide to The Next Big Thing" (for del.icio.us); and David Muir's EdCompBlog has a guide to del.icio.us, which also includes the value of using RSS feeds.