According to new Chinese regulations going into affect on March 16th, all weibo (microblog) users in China will be required to register their real identities to continue posting weibo messages. With the pace of new user signups already slowing, there are predictions that Sina and Tencent, the two major weibo services in China, will see a significant drop in the number of users once we reach the deadline and that this will severely limit what has become a relatively open platform for speech in China.