The privacy-friendly search engine DuckDuckGo has been blocked in China, company CEO Gabriel Weinberg has told Tech in Asia. Weinberg said he was unsure when the blockade began, but Chinese censorship monitor Greatfire.org suggests it started early this month. In China, where local search operations like Baidu rule the roost, Google Search has also been blocked since May. Yahoo Search and Microsoft’s Bing are both allowed in China as both companies have local servers, but they have to heavily censor their results in the country. DuckDuckGo benefited from Edward Snowden’s mass surveillance revelations, as it allows people to search for things without being tracked, though the fact that it is U.S.-based worries some privacy advocates.