Caracas - Venezuelans have been scrambling for dollars for weeks, taking refuge in the greenback as their own currency is in free fall. Rather than address the economic imbalances behind the bolivar's plunge, the government is going after the bearers of the bad news - it's blocking websites people use to track exchange rates on the black market.Cyber activists say the crackdown goes to absurd lengths, even targeting Bitly, the popular site for shortening web addresses to make it easier to send them as links via Twitter and other social media. For more than two weeks, access to the service has been partially censored by several internet service providers in Venezuela, apparently because Bitly was being used to evade blocks put on currency-tracking websites.The New York company says such restrictions have only previously been seen in China, which has one of the worst records for internet freedom, and even then not for such an extended period. Opponents of Venezuela's socialist government say the controls are designed to obscure reporting of the nation's mounting economic woes.Municipal elections"We help connect people with information and insight about their world," Bitly CEO Mark Josephson said. "When someone is standing in the way of that mission, that's not something we feel good about."Bitly got caught in the crossfire of Venezuela's polarized politics a month ago, shortly after President Nicolas Maduro decided to block access to sites such as www.dolartoday.com that publish the black market rate for the bolivar, which is now 10 times the official rate of 6.3 bolivars per dollar.Maduro accuses the sites of fuelling an "economic war" against his government, which is facing municipal elections this weekend that will be its first political test since he narrowly won the presidency in April following Hugo Chavez's death. Many are also openly critical of the government.But with the blocks in place, many sites managed to skirt the controls by migrating to Twitter, keeping hundreds of thousands of Venezuelans informed of the black market rate by using Bitly to direct traffic to newly created websites.In response, telecommunications regulator Conatel sent a letter to Twitter on 19 November asking it to immediately shut all accounts used to violate Venezuela's currency controls, warning that its failure to do so would be "highly damaging to the Venezuelan economy". Twitter has ignored the request but declines to comment on the matter.Around the same time, Bitly vanished without notice - at least for the vast majority of Venezuelans who are subscribers to the state-run service provider, CANTV. As a result, the average number of clicks on Bitly-generated links has fallen by half to about 1.5 million a day in Venezuela, Josephson said."It's like shutting down all the highways in the country because there was an accident on one street," said Luis Carlos Diaz, a cyber activist and tech columnist for the Caracas newspaper Tal Cual.