I absolutely love getglue.com - Track your interests aloing with your friends.
This stuff from Getglue is cool. It helps you connect with your facebook friends who have looked at the same thing as you have. You install the plugin on your firefox and connect it with your facebook account. Once you have done that, go to amazon to buy a book or browse to wikipedia and look at your favorite movie and see who else from your friends have visited that same thing.. now talk to them about it. It would kind of cool to have this work off from any of the profiles.. for example mydeveloperWorks... Obviously, you can discover folks with peer interests and connect to them.. I think this is exciting stuff. I have asked these folks to include developerWorks as a getglueable site.. I really hope they add it.