Facebook rules out 'panic button' Facebook says it will not install a "panic button" on its main pages for users to report suspected paedophiles, but will develop its existing reporting system. China unveils homemade helicopter China's first domestically developed civilian helicopter takes off on a maiden flight in the eastern province of Jiangxi. Choice screen gives browser boost Web browser Opera says its downloads in Europe have doubled since Microsoft began offering a choice. Spammers survive botnet shutdowns A series of strikes against botnets has not dented cyber criminals' appetite for sending spam, say security experts. Hacking "fun" for British teens Teenagers try to get into each other's online accounts despite knowing it is wrong, according to a new survey. Web inventor calls for open data Countries should be judged on their willingness to open up public data, the inventor of the world wide web tells the BBC. UK 'can cope with cyber attack' The UK is "reasonably well placed to cope" with a large scale cyber attack, a report by a group of peers has said. O2 condemns file-sharing letters The mobile network condemns a law firm for sending letters to alleged illegal downloaders, including its own customers. Mobile application sales explode The global economy for mobile applications will explode over the next two years into a $17.5bn industry, a study suggests. dot.Rory Data czar to politicians: I'm watching you