Social Bookmarking

• Common Bookmarking Features: browser bookmarklets and toolbars, tagging, annotating, import/export
• Common "Social" Features: visible with public vs. private options, network with "friends," subscriptions to follow specific tags, individually pushing and receiving links, and just the general "who bookmarked this also bookmarked" ability.

Tools:

• Del.icio.us—robust annotation options (annotation window), easy add without a bookmarklet, rss out output for both user and individual tags (see below), cross-tag organization, full toolbar and firefox add-on, widgets on LOTS of sites (Facebook, personal portals/homepages, etc.)
• Furl—robust annotation (annotation window), caches pages, no easy way to add pages without a bookmarklet, not as many built in social features. March 2009 update: Furl is not part of Diigo.
  
• Diigo—caches pages, highlight and annotate on individual webpages, really robust annotation options, has groups (could make classes), lists can be made into web-videos (click on "Tools" above for an example), full toolbar, connect to blog, simultaneous bookmarking (plays well with others bookmarking services like delicious), output widget in javascript, slight learning curve in learning all the tools.
• Fleck—physically situates annotations on individual webpages, can share via email, connect to blog; very useful if you want to "lecture" from a webpage and set up notes in advance.
• ClipMarks—easily clips images, videos, and text; does not capture page title when clipping, it can email and blog clips, clipcasts (see above on the right), facebook friendly, ranks ("pops"), significant learning curve to work in the account, cranky browser tool that does not work well with other bookmarking browser tools.
  
• Stumble Upon—surfing tool, ranking tool, provides rss output
  
• Digg—ranking tool, difficult to input new bookmark, biased ranking based on the types of users; however, check "digg the candidates" as a cool use of the "socialness" of the tool.
  

• Track your own sources
• Follow bookmarking of other scholars in your field

• Sharing resources with students (can output as an RSS feed)
• Sharing tags with colleagues
  
• Tracking students’ research process through what they bookmark (and annotate)

• Track their own resources
• Create Annotated Bibliographies for research projects
  
• See what others have collected on a certain topic/theme/issue (follow a chain of research)