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At the Mobile World Congress in Barcelona, one of the world鈥檚 biggest annual mobile get-togethers, the makers of the Firefox browser have unveiled their new operating system for the handset. Who is going to use it and how will it compete with other systems. Rory Cellan Jones reports on the highlights from the Barcelona event.(Photo by David Ramos/Getty Images)

Three years on from the Chilean earthquake, Click hears from Feliks Vainik about the early warning system that aims to save lives in the event of another quake. And Camila Ruz reports on how ordinary citizens might help to monitor tremors.

The last presidential election in Kenya was marred by violence. In the forthcoming election what role might technology play in curbing the violence; and how have politicians embraced social networking to get their messages across. Michael Kaloki reports from the capital, Nairobi.