Millions of pounds are being spent by all political parties to get their messages in front of you. But do you realise what you see might not be what your friends, family or anyone else you know is seeing?So what is it? How does it work? And why are your shopping habits relevant?The BBC’s Ben…

Millions of kilos are being spent by all political events to earn their messages in front of you.

Nonetheless make you realise what you conception obtained’t be what your friends, household or somebody else you understand is seeing?

So what’s it? How does it work? And why are your shopping habits linked?

The BBC’s Ben Moore explains the device.

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