On the 20 November programme:

It started as a campus craze just three years ago but now seven million people in the UK are active members of Facebook. And more than half of them use the site every day.

It's just one of a host of social networking websites which are changing the way we share our lives with our friends. But are we sharing too much - and should we be doing it at work?

It's been reported that in the last three years more than 1,500 public sector workers were sacked for spending too much time socialising online. And one piece of research claims British workers waste more than two hundred million hours every month surfing the web when they should be getting on with their jobs.

But it's big business. Last month Microsoft paid $240 million for less than two per cent of Facebook, valuing the company at over $15 billion dollars.

So is social networking a business opportunity - or an economic catastrophe?