Weibo and WiFi
The Chinese micro-blogging site Sina Weibo floats on the US Nasdaq stock exchange. What does the way social media is used in China mean for its financial prospects? Martin Varsavsky created a global system for WiFi sharing called Fon - he's now crowdsourcing funds to launch Gramofon, a combined wifi-sharing and music streaming device. And how BitTorrent is teaming up with content creators to try to lose its association with digital piracy.
Presented by Rory Cellan-Jones, with special guest Charlotte Connelly, curator working on the Information Age at London's Science Museum. The programme also features BBC technology journalists Carolyn Rice and LJ Rich.