A list of people worth following on Twitter (a sentence I once could never imagine writing, but then I couldn't imagine the Orange Fascist Buffoon in the WH either):

Armando at DKos

Strobe Talbott

Roy Edroso

Rebecca Traister

Eric Boehlert

Neeri Tanden

Simon Schama

Al Giordano

Peter Daou

Charles M. Blow

David Frum

Anne Applebaum

Sarah Kendzior

Paul Waldman

Norman Orstein

Joan Walsh

EJ Dionne

Brian Beutler

Bruce Bartlett

Paul Krugman

and in a lighter vein

Jen Kirkman

Joss Whedon

Andy Richter

Morgan Murphy

Mike Birbiglia

Quinn Cummings

Seth MacFarlane