Concentrated in a few hands, big data is a threat to democracy. Social media companies and political data-mining firms such as Cambridge Analytica have built their businesses by manipulating public life using personal data. Their work has helped heighten ethnic tensions, revive nationalism, intensify political conflict, and even produce new political crises in countries around the world — all while weakening public trust in journalism, voting systems, and electoral outcomes.
Such crises are symptoms of a deeper problem: the effective monopoly that a handful of technology firms have gained over a wealth of information relevant to public life. Fixing the situation requires putting the public back in charge of its data.
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