Facebook has firmly denied this since 2016.
Here's what they look like.
Take back control of your information with these easy steps.
Chris Wylie said it is 'completely reasonable' to conclude Remain could have won.
He offered to send one of his deputies instead.
They can record your IP address, friend's phone numbers, email addresses and even the contents of your messages.
'Enough is enough Jeremy Corbyn.'
Focusing on the moral and ethical standards of companies like Cambridge Analytica and Facebook is distracting us from two major parts of this unfolding story
While change is needed, it’s important to not get too carried away with the extent to which data can decide elections