Let me start off by saying that I have been using del.icio.us for some time now as my bookmarking tool. It is functional and it serves me well. Recently I discovered Diigo which has a lot more features available to the user. Wow is what I have to say right off the bat. Not only can you bookmark a site for future reference, you can hightlight passages and add sticky notes right to the page. You can add notes as well. All of your stickies, notes, and I believe highlights can be made public or private. In the Diigo sidebar, you can choose from annotations which I just mentioned or readers. In the readers section you can see who is reading (or read) that particular post as well as who is a reader of the site.
Like del.icio.us, you can access your bookmarks from any computer and even an iphone. You can add tags or lists to keep track of similar findings. If you have a blog, you can send what you find right to it. They have a “send to blog” feature that will allow others to see what you are blogging about. I haven’t tried that feature yet, but will have to give that a try in the near future.
For classrooms, you can create groups that are private, semi-private or public. So if the class is doing a research project, anything that you highlight can be shared with the group. Stickies can be left to discuss the topic, questions people have, or notes for future reference. The group leader can also set up a tag dictionary, so the group can be consistent in it’s use of tags.
Diigo also has a social piece to it. As you are reading, in the sidebar you will see other people who have bookmarked the site and other related content as well. You can subscribe to tags to keep current with specific topics. Also, you can subscribe to sites and other Diigo users. The creators of Diigo will also find content based on your bookmarks.
There is also a “people like me” piece that allows you to find people with similar interests. People can be followed, invited, and sent messages. You have the capability to create an online presence, allowing people to know as much or little about you as you like. This piece of Diigo has a Facebook feel to it.
This obviously can be used for students who are doing research. I would be interested to see how educators and students are using it to improve their learning.