In a world of credit cards, online banking, mobile phones and social media, we’ve never been easier to trace and to follow. How can people disappear in a world where everything we do leaves digital footprints? Tim meets with Renate Samson, Chief Executive of Big Brother Watch, and Olivia Allison, director in KPMG’s corporate intelligence team. They describe the infinite ways in which we all leave a data trail, and who is it that can – and will – follow it.