China's Tencent Overtakes Facebook

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The owner of the WeChat social network also has stakes in Lyft and Tesla and is a leader in gaming. Should its Western rivals be worried about its ambitions? We hear from Kitty Fok, Managing Director of IDC China, and we visit London's V&A museum to see a digital exhibit of the WeChat platform. Plus, we meet Oliver Montague, an inventor who believes the future of mass electric transport lies not in high-end cars, but in bicycles. Presented by Rory Cellan-Jones, with BBC tech reporter Zoe Kleinman, and special guest Joon Ian Wong from the Quartz website. (Image: The logo of Chinese instant messaging platform WeChat on a mobile device, Credit: PETER PARKS/ AFP/ Getty Images).