Facebook's CEO Mark Zuckerberg has met US Senators before two days of congressional hearings. He will testify on how the data of 87-million users were compromised through his social-media platform. As CGTN's Daniel Ryntjes reports, Zuckerberg is likely to receive a frosty reception from law-makers.

DANIEL RYNTJES WASHINGTON "The accounts were compromised starting in 2013 when - Facebook founder Mark Zuckerberg now admits - the company had lax control of the personal data it allowed third-party app developers to access. That data was passed on to the firm Cambridge Analytica, working for the Donald Trump 2016 presidential campaign, to identify American voters susceptible to targeted social media. Zuckerberg knows this scandal has done harm to his company's image. He will try to outline how Facebook has introduced new tools to address such vulnerabilities. He's also under pressure to address the proliferation of fake news on his platform, particularly from Russian sources. U.S. intelligence agencies have concluded that Russia used social media to influence the presidential race, charges denied by Moscow.

Zuckerberg will appear on Tuesday before a Senate hearing and on Wednesday before a House of Representatives committee. The immediate challenge for Zuckerberg will be convincing customers and U.S. regulators that Facebook will safeguard the privacy rights of people. On Monday, Zuckerberg met with Florida Senator Bill Nelson:

BILL NELSON DEMOCRATIC SENATOR "If we don't watch out with social media and platforms, like Facebook, and the mistakes that they made in the past, then no American is going to have any privacy, anymore."

DANIEL RYNTJES WASHINGTON "The challenge for many lawmakers will be understanding how to regulate a site with more than two billion active users worldwide. And the broader challenge will be in setting new parameters for a technology industry that is constantly working out ways to monetize private 'big data' using artificial intelligence. Daniel Ryntjes, CGTN, Washington."