What you click on reveals a lot about you Rachel Torres/Alamy

Facebook knows more about you than you might think. A study has for the first time revealed the scale of its data gathering, suggesting the social media company has deduced sensitive information about nearly three-quarters of all Facebook users based in the European Union, totalling 40 per cent of all EU citizens – around 200 million people. By looking at the pages you like and the things you click, Facebook can infer your sexual orientation, religion and political leanings, then uses this information to target you with adverts.

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