It's got 600 million members and a truly international reach but is Facebook really worth $50 billion? And as new shareholders buy in, is the company destined to go public? Justin Rowlatt interviews the author of the biography of Facebook, David Kirkpatrick.
Plus, life after Facebook, why some members aren't happy with the success of the social networking site and are deciding to erase their on-line existence. We talk to Mike Atherton, one of these "Facebook suicides".
Plus our regular technology commentator Jeremy Wagstaff asks why the future of computing could be up in the clouds.