Facebook CEO Mark Zuckerberg will not be answering direct questions from British lawmakers over how users' data ended up in the political consultancy firm Cambridge Analytica. The company's Chief Technology Officer or Chief Product Officer will fill in for him instead. That's cited by Reuters from a company letter.

The company's Head of UK Public Policy said the other two senior executives were better placed to answer those questions. Earlier Zuckerberg has published apology letters on major newspapers, and vowed to adjust rules to guard users' privacy. But Facebook still faces huge selling pressure of its shares, a new investigation from the U.S. Federal Trade Commission and severe public distrust. Netizens are now calling to delete the Facebook app. Many companies also suspended their advertising on Facebook.