On Twitter of course! Here are the people we think entrepreneurs must follow:

Venture Hacks: http://twitter.com/venturehacks
NYC Venture Capitalist Fred Wilson: http://twitter.com/fredwilson
Entrepreneur and Investor Chris Dixon: http://twitter.com/cdixon
HBS Prof Noam Wasserman: http://twitter.com/noamwass
HBS Prof Tom Eisenmann: http://twitter.com/teisenmann
Stanford Prof Tina Seelig: http://twitter.com/TSeelig

Almost all of them have blogs as well, but we like to go on Twitter and get a little celeb gossip mixed into our stream of professional advice too. We hope you find their insights helpful.