Beijing city authorities on Friday issued new rules requiring microbloggers to register their real names before posting online, as the Chinese government tightens its grip on the Internet. The city government now requires users of weibos -- the Chinese version of Twitter -- to give their real names to website administrators, its official news portal said. The new rules will apply to weibo operators based in Beijing, which include Sina -- owner of China's most popular microblogging service which has more than 200 million users. "Websites with weibo operations must establish and improve a system of content censorship," according to...