Even if you are the most careful person in the world when it comes to your data, little pieces of your personal information are constantly being uploaded into the digital world without you being aware of it. How? Because of your connections to everyone around you.

The idea of personal privacy might not even apply any more. Your family, friends, even a random guy you bought a couch from a decade ago all have information about you that is incredibly valuable to technology companies - from phone numbers and emails in a contact list, to new baby photos and even the code of your DNA - all of it is being harvested, sold and used without you having any way to know about it, let alone have any control.

And Aleks Krotoski discovers that when those little pieces of the digital jigsaw are put together, they can have unexpected and sometimes shocking consequences in our real lives.