What are the accusations against Cambridge Analytica?
Who are Cambridge Analytica?
Cambridge Analytica has been thrown into turmoil after finding itself in the middle of Facebook data harvesting
The firm, which has offices in London, New York and Washington, boasts to clients that it can 'find your voters and move them to action'.
What are their ties to Aleksandr Kogan?
The controversy centres around their use of the GSR app, developed by the Cambridge University research Dr Aleksandr Kogan.
Facebook users used the app to answer a personality survey which plundered the data of 100million users.
How was Cambridge Analytica used in the Brexit and Trump campaigns?
It has been claimed that Cambridge Analytica used the information to assess peoples' personalities and come up with political strategies to sway voters to back Brexit and Donald Trump.
The firm has insisted it did no actual work for the Brexit campaign - although it did pitch for work with Leave.EU.
But whistleblowers say that Arron Banks - the co founder of Leave.EU - used the ideas gleaned from the itch to pursue his own CA-style model to predict and influence voters' behaviour in the EU referendum.
Mr Banks denied the allegations
Cambridge Analytica suspended its chief executive, Alexander Nix, after recordings emerged of him making a series of controversial claims.
Why was Vote Leave embroiled in the scandal?
It is also claimed that campaign chiefs at Vote Leave - the official pro Brexit campaign group - may have broken the law in the campaign.
It is claimed that they donated £650,000 to the other pro Brexit group BeLeave in the final days of the campaign and told them to spend it on data advertising by the Canadian firm Aggregate IQ - breaking election rules.
Whistleblowers have claimed that Cambridge Analytica has undisclosed links to the Canadian digital firm AggregateIQ