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Xiaomi - dubbed 鈥淐hina鈥檚 answer to Apple鈥� - launches new mobile devices including a flagship model seen as critical to the company鈥檚 ability to tackle the US market. We hear from the company's Vice President of International, Hugo Barra.

In the wake of the terrorist shootings in Paris last week, attention has again fallen on the ability of violent jihadists to communicate and coordinate attacks online. We quiz Doug Leeds, the CEO of Ask.com, which owns the Q&A social network Ask.fm, on how he is trying to address this challenge.

And Melanie Sevcenko reports from the US state of Oregon on a new mobile app allowing the public to video-record how the police deal with them or their fellow citizens.

Presented by Rory Cellan-Jones, with special guests the Silicon Valley watcher, evangelist, and author Guy Kawasaki who gives us tips on getting the best from social media, and the international venture capitalist Eileen Burbidge.