This fantastic news browsing tool just got a redesign:
A case study they wrote on their redesign process:
Excellent new tool for social sharing. Create rich images with music, video, sound, text and more.
Paul Adams, Social interaction design lead for FB, lists his favorite brand pages right now
Tool for pulling in social media feeds through AJAX
Social TV Analytics for Brands
Hunch’s “Taste Graph” is a development platform for apps that connect people based on their tastes.
Free service that tells you who your most influential followers are and how much you influence them (takes 30 seconds or so)
jQuery plugin for making custom social sharing widgets.
Now in public beta. Create a variety of automated tasks hooking up your various accounts (facebook, twitter, flickr, etc).
From Microsoft, an SDK for building HTML5/.NET social games. Comes with a example game built Grant Skinner and his team (includes server-side code and documentation).