DECEMBER 19, 2011 9:52 AM EST
 

SINA Corporation is getting clobbered again early Monday. Shares are down 6.8 percent to USD 51.32.

Today's action reverses Friday's upside seen following news about regulation of the company's microblogging weibo service, which was widely anticipated.

On Friday, the company said the Beijing Municipal Government issued new rules on microblogging. The Rules, among other things, require users of microblogging services to register their identities with microblogging service providers.