http://www.flickr.com/photos/creative_tools/5360271271/in/photostream/News: Breaking news, World's real time newspaper, Really good tool for sharing common experiences like conferences.
Commentary - What people care about and what they have expertise in
Business - Key business channel for companies to engage directly with customers, partners, and other constituents
Ambient Intimacy - Provides lightweight connection, know what they are doing without having to respond
Mind - See what individuals are thinking about, and what groups are focusing on