Facebook data scandal News
The plummeting stock price of wiped out about $150 billion in Facebook's market capitalization in under two hours.
Twitter, however, said it had banned GSR and Cambridge Analytica from buying data or running adverts on the website and that no private data had been accessed.
Zuckerberg said that there was a quiz developed by a university researcher "that leaked Facebook data of millions of people in 2014".
He claimed that neither he nor Cambridge Analytica had anything to do with "dirty tricks" in the use of information harvested from Facebook.
Tech companies can and should do more to protect users, including giving users far more control over what data is collected and how that data is used.
Following a scandal over the hijacking of personal data from millions of the social network's users.
Sandy Parakilas shed fresh light on business practices that are alleged to have enabled Cambridge Analytica to gain unauthorised access to the personal data of tens of millions of US voters.
The big platforms say they have built in protection, such as human reviews and automated scanning tools to detect abuse by partners.
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