Sina Weibo is a social networking and microblogging service based in China with more than 500 million registered users. Sina Weibo was launched in august 2009 and is owned by SINA Corporation, the largest Internet portal in China. It's mostly used for people who speak, read and write Mandarin and Cantonese. Sina Weibo implements many features from Twitter. Users can post with a 140-character limit and mention/talk to other people using "@UserName" Because Twitter and Facebook are blocked in China it has led to a situation where the social media scenes are dominated by domestic brands and not the international ones. Many will say that Weibo is twitter of China.