- Sina Weibo is a Chinese microblogging platform launched in 2009 by Sina, a leading Chinese online media company. - It has grown rapidly, reaching over 80-100 million users by the end of 2010. Many celebrities and elite users moved to Sina Weibo from Sina's existing blogging platform. - Sina Weibo has become profitable for Sina and is expected to generate over $100 million in advertising revenue alone by 2013, making it one of Sina's most important assets.