Diigo groups allow group members to comment on and “like” bookmarks shared with the group. These are features that Delicious doesn’t provide, and I’m eager to test them out with students. We live in a participatory culture, and our students expect to be able to interact with content they consume. “Liking” and commenting are interaction tools that my students should be comfortable using given their experiences on Facebook, and these tools should tap into students’ desires for community and sharing quite nicely.