The government's requirement to verify the identities of users of Sina Corp's (NASDAQ: SINA) microblogging service is detrimental to the company managing the platform, Sina managing director Cao Guowei said in a teleconference. But despite this, Weibo, as the service is known in Chinese, will play a leading role in generating profits for Sina this year, according to Cao. Separately, Sina posted $9.3 million in net earnings for Q4 2011, turning around from $100 million in the red during the same period a year earlier.