First, the option to look up people in different ways such as their real name, user name or how they tagged something allows for better networking. I also am very impressed with the idea of lists. Although, I am still trying to figure out how to implement them, I am excited that this would be a great tool for the classroom use for research and or sharing. In addition, I have just spent hours trying to figure out the snapshot feature. I think I will break down and watch a tutorial. However, I truly like to try to figure things out on my own. It seems to me I am just hitting the surface of Diigo. Delicious does not seem to have as many bells and whistles.