Zuckerberg faces US House of Representatives on the second day

Facebook CEO Mark Zuckerberg has revealed during a second day of sparring with US politicians over privacy concerns that he was among the 87 million users whose data was improperly shared.

Facebook boss Mark Zuckerberg Source: AAP

Yesterday Mr Zuckerberg has apologised for the leak of the personal data of tens of millions of users, as he faced the United States Congress where he also issued a stark warning about Russia's efforts to manipulate elections around the world.