Facebook CEO apologizes for allowing third-party groups like Cambridge Analytica to take advantage of user data
Zuckerberg's comments, released in advance of the hearing in Brussels, are the latest part of a tour of contrition over the Cambridge Analytica scandal that began in the US Congress in April.
Company shares jump 4.5 pct on Tuesday
The House of Representatives' Energy and Commerce Committee announced Wednesday what appeared to be the first congressional appearance by Zuckerberg since the scandal broke on the hijacking of data on tens of millions of users.
Zuckerberg explained there was a quiz developed by a university researcher "that leaked Facebook data of millions of people in 2014".
The latest crisis laying siege to the leading online social network has raised the specter that he has lost control of his creation and been naive about the unintended consequences of people sharing so much about themselves.
"We were not as on top of a number of issues as we should have, whether it was Russian interference or fake news," CEO says
His speech capped a nostalgic visit for the 33-year-old billionaire, which included a visit to his old dorm room.
Mark Zuckerberg writes an "essay" on Facebook, which offers a detailed, idealistic vision of the role of the world's biggest social network
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A study released by researchers at Deloitte says that Facebook enabled $227bn of economic impact.
"We're going to continue building these partnerships, but connecting the whole world will require inventing new technology too," Facebook founder Mark Zuckerberg wrote.