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1/3 In a major new series about how technology is reshaping our notions of privacy, Steve Hewlett asks what we reveal through our online behaviour and use of smart phones. He traces who analyses this behaviour, how it is used and on what terms. Are we aware of how much data we are giving away?

The programme explores how online behaviour can be tracked, monitored and exploited, from cookies to Facebook likes. It investigates whether privacy policies are of any real use or relevance. And it asks if we should all become more aware of the impact of our digital footprints.

Interviewees include representatives from social media companies, advertisers, app developers, academics and privacy campaigners.

Producer: Jane Ashley.