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Antigone Davis, global head of safety at Facebook, said in a post on the company's official website that Facebook is introducing new features that can detect and prevent unwanted contact like friend requests and messages from blocked users who may make a second attempt by setting up a new account.

Another reason luring more investors entering the market is that crude oil futures listing may be just around the corner, after several years of preparation, Zhan said.

Another goal of restructuring is to reduce excess capacity in the steel, coal, glass and cement industries. According to Ministry of Industry and Information Technology spokesman Huang Libin, "In the first quarter, the comprehensive utilization rate of the steel segment recovered to about 80 percent, a reasonable range." Overall industrial capacity utilization rose to 76.5 percent, up by 0.7 percentage point year-on-year.

Another batch of more than 600,000 students from elementary, middle and high schools in Shanghai returned to campus on May 18.

Another 26 suspects have been caught or persuaded to surrender by the police so far. The case has been transferred to the procuratorate.