Asian tech site Penn Olsen reports that the Chinese online media company Sina, mainly known for its Twitter-like Weibo microblogging service, launched Sina Luxury on Friday. The new e-store enables designers to sell their collections directly to customers – those who have already signed up include highest-profile Western brands such as Dior, Burberry, Gucci, and Paul Smith, all “100 percent guaranteed genuine,” as the homepage states, referring to China’s counterfeit problems.