Quick and evolving list, most are Twitter handles. Follow them!
Marc Benioff is the big guy at CEO
Benioff’s Shoes for a different kind of insight
Steve Molis is brilliant, hilarious, and shoots very straight
Appirio offers insightful content
Salesforce Support will answer questions
Salesforce Developers send out great nuggets of info
Salesforce Careers–where you can find your #dreamjob