Facebook has denied reports which claimed it "conducts research and then systematically and wilfully ignores it if the findings are inconvenient for the company".
At least eight people have been killed and several are injured after a gunman opened fire at a university in the Russian city of Perm, officials have said.
At least eight people have been killed and several are injured after a gunman opened fire at a university in the Russian city of Perm, officials have said.
At least eight people have been killed and several are injured after a gunman opened fire at a university in the Russian city of Perm, officials have said.
