What that Facebook quiz is doing to your privacy

"Nix [Cambridge Analytica] has frequently talked about the number of individual data-points Cambridge holds on people: factual, attitudinal and behavioural. "We have somewhere close to four or five thousand data points on every adult in the US," he told a summit in New York last year."

"Think about that for a moment: 5000 data-points on about 220 million Americans. Name, gender, birth year, postal code and email are just five items we all commonly supply. Nix claims CA has around 4995 other pieces of information about most American adults."