The following request from Diigo got me thinking about this question. Diigo, a SOCIAL bookmarking site has noticed that few use the social opportunities the bookmarking site allows and wonder if it is worth the expense. I use Diigo as my personal bookmarking site and offer access to my own site to my students.
The idea in the social of social bookmarking is that users can share access as a way to identify helpful resources identified by others. On the surface, this makes some sense. One can follow someone you consider a leader or someone with similar interests and see what they have uncovered. I do not use this capability a lot, but I do use it some. I would think sharing with students would be a great application.
I wonder if many ways for locating resources (RSS, social bookmarking) have been abandoned as people rely on Twitter. Microblogs would seem useful for current events, but not as a way to search.
Diigo plans (for those interested)