A shady UK data analytics company, with the help of a 24 year old tech genius developed an innovative technique to ‘hack’ facebook and steal 50 million user profiles. Then they used this data to help the Trump and Brexit campaigns psychologically manipulate voters through targeted ads. The result was Vote Leave ‘won’ the UK’s Brexit referendum and Trump was elected president in the US.
Their SDK makes it really easy to hook up a “Login With Facebook” button, but maybe the biggest reason is conversion tracking. When app-makers run ads on Facebook, they want to know how many people who saw their ad went on to download their app. So Facebook asks developers to “phone home” whenever their app starts.