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The Obama campaign created a Facebook app for supporters to donate, learn of voting requirements, and find nearby houses to canvass. The app asked users’ permission to scan their photos, friends lists, and news feeds. Most users complied.
The people signing up knew the data they were handing over would be used to support a political campaign. Their friends, however, did not.
The people who downloaded the app used by Cambridge Analytica did not know their data would be used to aid any political campaigns. The app was billed as a personality quiz that would be used by Cambridge University researchers.
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