William Farris | Google+ :: Sina Weibo has censored the name "Chen Guangcheng" (陈光诚) for some time now. However, as the screenshot shows, as of the morning of April 27, 2012 (Beijing time), it was not censoring "CGC."
HT: Steven Millward via Google+
Screenshots and further details reported by William Farris on plus.google.com
See also an additional series of posts by William Farris on plus.google.com