Chinese portal Sina Corp.'s quarterly profit tumbled 75 percent on relatively small revenue for its microblog service.
Sina Corp., which operates a popular Chinese Internet portal, said Thursday its quarterly earnings tripled but cautioned that its fast-growing Weibo microblog service is unlikely to produce significant operating profit this year.

As big-city politician Bo Xilai rose to nationwide prominence with an anti-mafia crusade and mass sing-alongs of communist anthems, many of China's leaders trekked to his metropolis approvingly. Not President Hu Jintao.
Beijing authorities on Friday ordered Internet microblogs to require users to register with their real names, a tightening of rules aimed at controlling China's rapidly growing social networks.
Sina Corp., a popular Chinese web portal operator, sank to a loss in the latest quarter due to writedowns on investments in two online businesses but revenues and microblog traffic were up.

Stepping up its long-running struggle with the United States over access to technology, China this year embarked on a campaign to target advanced industries such as aerospace, medicine and information technology for its next stage of development.
China's most popular microblogging site is cracking down on what it says is the spread of false rumors after the ruling Communist Party told Internet companies to tighten control over information online.
A Communist Party leader has told China's Internet companies to tighten control over material online as Beijing cracks down on dissent and tries to block the rise of Middle East-style protests.
A Communist Party leader has told China's Internet companies to tighten control over material online as Beijing cracks down on dissent and tries to block the rise of Middle East-style protests.