Diigo is a social bookmarking site similar to Delicious but with more features that are beneficial for the classroom. If you are unfamiliar with social bookmarking, let me explain. When you sit at a computer, you can find a web site you really like and bookmark it or add it to your favorites so you can go back to it in the future. The problem with bookmarking on a computer is that in order to get back to that bookmark, you have to be on THAT SPECIFIC computer. If you bookmarked the site at school, when you go home it doesn’t appear on your list. If you bookmark it on one computer in the lab, you must bookmark it on every computer in the lab in order to have access to it. So, the first great thing about Diigo is that your bookmarks follow you wherever you go. When you bookmark a site using your Diigo account, you can have access to it at work, home, the computer lab or library. The other great thing is that once you bookmark it, you can share your book mark links with students and colleagues and they can all have access to your sites.