'Three million Facebook users had their most intimate details exposed, it has emerged, as a new data protection scandal hits the social network.
A popular personality app failed to provide adequate protection to the 'anonymous' data of participants, the latest of a string of security breaches.
The quiz, called myPersonality, collected highly sensitive data - including psychometric test results that reveal how neurotic or extrovert an individual may be.
Investigators found the information was poorly protected for four years and gaining access to it was relatively easy.
The myPersonality app has now been suspended as one of 200 Facebook has removed from its social network.
Run by the University of Cambridge, the myPersonality site was founded in 2007 and allowed users to take real psychometric tests and obtain their results instantly.
The leaked information gave access to the 'Big Five' personality scores of 3.1 million users, according to a report from New Scientist, who broke the news.
These have been defined as openness to experience, conscientiousness, extroversion, agreeableness and neuroticism - sometimes abbreviated to OCEAN.
'This type of data is very powerful and there is real potential for misuse,' Chris Sumner at the Online Privacy Foundation told New Scientist.
More than six million people took part in the study overall, and 40 per cent of these participants decided to share their Facebook profile information with the researchers.'
Read more: Intimate details of 3 MILLION Facebook users were exposed in a new data leak, including the results of personal psychological tests
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