POLITICIANS AND DIPLOMATS
Carl Bildt (@carlbildt) -- Swedish foreign minister and one of the most candid diplomats around. But he's having a hard time keeping up with @sweden these days.
Hugo Chávez (@chavezcandanga) -- With more than 3 million followers and a penchant for handing out free houses to tweeps, the Venezuelan strongman is a force to be reckoned with.
Paul Kagame (@PaulKagame) -- President of Rwanda and Twitter fanatic.
U.S. Sen. John McCain (@SenJohnMcCain) -- Leader of the loyal opposition.
Michael McFaul (@McFaul) -- Barack Obama's ambassador to Russia, live and occasionally uncensored.
Susan Rice (@AmbassadorRice) -- Most official Twitter feeds are unspeakably dull. But Obama's U.N. envoy stands out for her passion and candor.
Ilves Toomas (@ilvestoomas) -- The president of "E-stonia" posts regularly with thoughts on technology and economics, but really made headlines this year with a profanity-laced rant against New York Times columnist Paul Krugman.
Tom Watson (@tom_watson) -- Garrulous member of the British parliament and scourge of NewsCorp.ROSLAN RAHMAN/AFP/GettyImages