Craig Timberg Tony Romm And Elizabeth Dwoskin The Washington Post

Facebook said it is investigating whether an organization backed by billionaire and Democratic megadonor Reid Hoffman violated the social media giant's policies when it set up a series of misleading news pages in a bid to target U.S. voters with left-leaning political messages.

YouTube does not have a policy against falsehoods.

The more than 250 pages of documents, which a British parliamentary committee recently obtained as part of a wide-ranging investigation into Facebook, revolve around a decision Facebook made in 2014 and 2015 to cut off developers' access to posts, photos and other profile information from Facebook users.

Facebook chief executive Mark Zuckerberg endured an hours-long grilling by dozens of U.S. senators Tuesday during which he repeatedly apologized and promised privacy reforms but also pointedly defended his company against the threat of new legislation.

Facebook said Wednesday that "malicious actors" took advantage of search tools on its platform.

Facebook said Wednesday that "malicious actors" took advantage of search tools on its platform, making it possible for them to discover the identities and collect information on most of its 2 billion users worldwide.

Facebook and Cambridge Analytica have been embroiled in investigations in Washington and London for months, some of this weekend's demands have taken on a more personal tone, focusing explicitly on Zuckerberg.

U.S. and European officials on Sunday called for Facebook chief executive Mark Zuckerberg to explain how personal information about tens of millions of users ended up in the hands of a data analysis firm that worked for President Donald Trump's 2016 campaign - without the permission or knowledge of the vast majority of those affected.

Facebook said it is investigating whether an organization backed by billionaire and Democratic megadonor Reid Hoffman violated the social media giant's policies when it set up a series of misleading news pages in a bid to target U.S. voters with left-leaning political messages.

YouTube does not have a policy against falsehoods.

The more than 250 pages of documents, which a British parliamentary committee recently obtained as part of a wide-ranging investigation into Facebook, revolve around a decision Facebook made in 2014 and 2015 to cut off developers' access to posts, photos and other profile information from Facebook users.

Facebook chief executive Mark Zuckerberg endured an hours-long grilling by dozens of U.S. senators Tuesday during which he repeatedly apologized and promised privacy reforms but also pointedly defended his company against the threat of new legislation.

Facebook said Wednesday that "malicious actors" took advantage of search tools on its platform.

Facebook said Wednesday that "malicious actors" took advantage of search tools on its platform, making it possible for them to discover the identities and collect information on most of its 2 billion users worldwide.

Facebook and Cambridge Analytica have been embroiled in investigations in Washington and London for months, some of this weekend's demands have taken on a more personal tone, focusing explicitly on Zuckerberg.

U.S. and European officials on Sunday called for Facebook chief executive Mark Zuckerberg to explain how personal information about tens of millions of users ended up in the hands of a data analysis firm that worked for President Donald Trump's 2016 campaign - without the permission or knowledge of the vast majority of those affected.