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Revealed: 50 million Facebook profiles harvested for Cambridge Analytica in major data breach
webCredibility Rating
3/5
Good(3)Good quality. Reputable source with community review or editorial standards, but less rigorous than peer-reviewed venues.
Rating inherited from publication venue: The Guardian
A landmark news investigation relevant to AI safety discussions about data-driven manipulation, platform governance failures, and the risks of deploying behavioral targeting systems without adequate oversight or accountability.
Metadata
Importance: 65/100news articlenews
Summary
This Guardian investigation exposed how Cambridge Analytica harvested personal data from approximately 50 million Facebook users without their consent, using it to build psychographic profiles for targeted political advertising during the 2016 US election. The scandal revealed systemic vulnerabilities in social media data governance and the potential for AI-driven behavioral manipulation at scale. It became a landmark case in debates around data privacy, algorithmic influence, and the weaponization of personal data.
Key Points
- •Cambridge Analytica obtained data from ~50 million Facebook users via a third-party quiz app, exploiting Facebook's lax API permissions to harvest friends' data without consent.
- •The data was used to build psychographic profiles enabling highly targeted political messaging, raising concerns about algorithmic manipulation of democratic processes.
- •The breach highlighted how AI and data analytics can be weaponized to exploit human psychological vulnerabilities at population scale.
- •Facebook's platform policies allowed third-party apps to collect data on users' entire social networks, representing a major governance and accountability failure.
- •The scandal triggered global regulatory scrutiny, contributed to GDPR enforcement discussions, and sparked ongoing debates about AI-driven influence operations.
Cited by 1 page
| Page | Type | Quality |
|---|---|---|
| Erosion of Human Agency | Risk | 91.0 |
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Revealed: 50 million Facebook profiles harvested for Cambridge Analytica in major data breach | Cambridge Analytica | The Guardian
Skip to main content Skip to navigation Skip to navigation 13:04 Cambridge Analytica whistleblower: 'We spent $1m harvesting millions of Facebook profiles' – video The Cambridge Analytica Files Cambridge Analytica This article is more than 7 years old Revealed: 50 million Facebook profiles harvested for Cambridge Analytica in major data breach
This article is more than 7 years old Whistleblower describes how firm linked to former Trump adviser Steve Bannon compiled user data to target American voters
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Mark Zuckerberg breaks silence on Cambridge Analytica
Carole Cadwalladr and Emma Graham-Harrison Sat 17 Mar 2018 18.03 EDT First published on Sat 17 Mar 2018 09.01 EDT Share Prefer the Guardian on Google The data analytics firm that worked with Donald Trump’s election team and the winning Brexit campaign harvested millions of Facebook profiles of US voters, in one of the tech giant’s biggest ever data breaches, and used them to build a powerful software program to predict and influence choices at the ballot box.
A whistleblower has revealed to the Observer how Cambridge Analytica – a company owned by the hedge fund billionaire Robert Mercer, and headed at the time by Trump’s key adviser Steve Bannon – used personal information taken without authorisation in early 2014 to build a system that could profile individual US voters, in order to target them with personalised political advertisements.
Christopher Wylie, who worked with a Cambridge University academic to obtain the data, told the Observer : “We exploited Facebook to harvest millions of people’s profiles. And built models to exploit what we knew about them and target their inner demons. That was the basis the entire company was built on.”
Documents seen by the Observer , and confirmed by a Facebook statement, show that by late 2015 the company had found out that information had been harvested on an unprecedented scale. However, at the time it failed to alert users and took only limited steps to recover and secure the private information of more than 50 million individuals.
Profile Cambridge Analytica: the key players
Show Alexander Nix, CEO
An Old Etonian with a degree from Manchester University, Nix, 42, worked as a financial analyst in Mexico and the UK before joining SCL, a strategic communications firm, in 2003. From 2007 he took over the company’s elections division, and claims to have worked on 260 campaigns globally. He set up Cambridge Analytica to work in America, with investment from Robert Mercer.
Aleksandr Kogan, data miner
Aleksandr Kogan w
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