Facebook chief Mark Zuckerberg has expressed regret to the US Congress and accepts responsibility for the Cambridge Analytica data scandal for "not doing enough" to protect its users' personal data being misused.

In a statement released Monday on the eve of his first Congressional appearance, Zuckerberg accepted accountability for the social network's failure to protect private data of its 87 million users and prevent manipulation of the platform.

"We didn't take a broad enough view of our responsibility, and that was a big mistake. It was my mistake, and I'm sorry," Zuckerberg said in his written testimony released by a House of Representatives panel. "I started Facebook, I run it, and I'm responsible for what happens here. It's clear now that we didn't do enough to prevent these tools from being used for harm as well. That goes for fake news, foreign interference in elections, and hate speech," Zuckerberg said.

Zuckerberg, 33, who is facing the most terrible crisis of business, will state under oath before senators onTuesday and a House panel on Wednesday amid a conflagration over the harvesting of data on millions of Facebook users by the British political consulting firm Cambridge Analytica.

In prepared remarks released by a congressional panel, Zuckerberg confessed he was too idealistic and has been unsuccessful to seize how the platform, used by two billion people, could be abused and manipulated.