Getty Images Chris Wylie described to a London audience how Cambridge Analytica's "insanely" effective operations targeted voters. He said that programs associated with their work had conversion rates as high as 10%, more than 10 times greater than comparable efforts. It comes after Wylie's work was derided by US political operatives who claimed that Cambridge Analytica's "secret sauce" was nothing of the sort. Wylie says he has given documentation of the figures to The Observer, which has yet to publish them. The whistleblower behind the Cambridge Analytica scandal has refuted claims that the company's much-vaunted micro-targeting technology doesn't actually work. Chris Wylie, the 28-year-old who sparked a scandal around alleged misappropriation of Facebook data by his old employer, said that its micro-targeting efforts were 10 times more effective that those of rivals.See the rest of the story at Business InsiderNOW WATCH: A father and son are growing fruit and vegetables 8 metres below the surface of the Mediterranean Sea — here's whySee Also:Law-enforcement officers raid Cambridge Analytica's headquarters in LondonZuckerberg finally speaks on Cambridge Analytica scandal: He's willing to testify to Congress and thinks tech should be regulatedMozilla will pause paying for ads on Facebook because of the Cambridge Analytica scandal