Diigo introduced the option to play videos within Diigo groups. Since then I have had a couple of folks ask about creating groups within Diigo. The video embedded below provides an overview of how to create a Diigo group.
Applications for Education
Diigo groups provide a good place to share resources with students and have them share with you and each other. Diigo groups can be private. I ask students to add notes to the links that they share in a group. Those notes should provide the rest of the group with an explanation of why the link is useful.
For more information about Diigo take a look at Beth Holland's post on using the Diigo Outliner tool. Click here for a tutorial on using Diigo in Firefox.