Now playing Next World Zuckerberg - code, people and riches Around half the Internet users on Earth are signed onto Facebook. That meant more than 900 million by the beginning of April this year. Social 18/05/2012
Now playing Next Next Series Tracking the health of Europe's railways Safety on Europe’s railways is under the spotlight. Just over 3,000 accidents were reported in 2009, with 174 of those were caused by rolling stock 18/05/2012
