五毛 (literally, 50 cents / wumao), short for...

五毛 (literally, 50 cents / wumao), short for wumaodang or 50 Cent Party, is a pejorative term for Internet commentators hired by the Chinese government to post comments favorable towards party policies in an attempt to shape and sway public opinion on Internet message boards.

Why it is blocked: Though there has already been much media coverage about China’s professional web commentators and the government has openly acknowledged their presence, it still does no good (at least from the CCP’s perspective) to have accusations of “wumao" every time someone makes a pro-China commennt.