LONDON—The consultancy at the heart of a storm over Facebook data greatly exaggerated its role in Donald Trump’s 2016 U.S. presidential victory and would not have been able to sway an election result, says the academic who provided the data.
Facebook has been rocked by a whistleblower who said that Cambridge Analytica, a British-based firm hired by Trump for his election campaign, had improperly accessed information on millions of Facebook users to build detailed profiles on American voters.
