Twitter sent its digital street cred tumbling on Thursday night when it announced that it would being selectively censoring content as a way to enter countries with "different ideas" about freedom of expression. Though Twitter has never made promises along the lines of Google's "Don't Be Evil," the move nevertheless comes as a surprise for a company that took pride in helping grease the wheels of last year's Arab Spring uprisings.

In China, where Twitter is blocked but still accessible to those with the technical know-how to skirt the country's Web filters, the revelation seems to have hit particularly hard.

Among the first to comment on the announcement was Wen Yunchao, one of many Chinese dissidents who've embraced Twitter as an uncensored alternative to China's own heavily managed microblogging services:

Oh no! @Twitter says going to start censoring tweets in certain countries. Pls RT!act.demandprogress.org/act/twitter_ce… 通过 @demandprogress

— 北风 (@wenyunchao) January 27, 2012

It didn't take long for speculation to spread that Twitter had announced the change because it planned to make a play for the China market. A number of Chinese users promptly declared their intention boycott the service. Among those leveling the boycott threat was activist artist Ai Weiwei, who wrote in a characteristically pithy post, "If Twitter starts censoring, I'll stop tweeting":