Meta lawyers are reportedly looking at Facebook staff's involvement with Sandberg's foundation Lean In, and their work to help her promote her most recent book, "Option B".
Cambridge Analytica gathered details on as many as 87 million Facebook users without their permission. Their data is alleged to have been used to manipulate the 2016 presidential election.
Facebook is grappling with the worst crisis in its history, vilified for not more zealously guarding the information that users share.
Facebook has been under fire ever since allegations surfaced that London-based political consultancy Cambridge Analytica used data from tens of millions of Facebook accounts.
Zuckerberg was asked questions related to how Facebook was planning to tackle on the opioid crisis, data protection, targeted ad system and curbing of terrorist and malicious activities.
The notice says the app misused the information, including public profile, page likes, birthday and current city, by sharing it with the political data-mining firm Cambridge Analytica.
Under fire globally for allowing the data breach, social media giant Facebook will today start alerting the 87 million users, including 562,455 in India, whose data may have been compromised.
Whistleblower Christopher Wylie he will cooperate with a Justice Department investigation.
Facebook says it has suspended a Canadian political consulting firm amid media reports it had ties to Cambridge Analytica.
Currently, users can only delete messages from their own inboxes which will still show up in the recipient's thread.
The EU wrote to Facebook last week to ask how many Europeans were affected by the growing scandal over the harvesting of personal data shared with Cambridge Analytica.
Analytica has been accused of harvesting personal information of over millions of Facebook users illegally to influence polls in several countries.
In a blog post, Mike Schroepfer, Chief Technology Officer at Facebook, showed country-specific break-up of people affected by the data breach.
Facebook's chief technology officer Mike Schroepfer made the announcement in a statement announcing the implementation of new privacy tools for users of the huge social network.
Facebook is battling a firestorm following revelations that Cambridge Analytica obtained the data of its 50 million users to manipulate US voters in the 2016 presidential election.
The bulk removal tool will make it much easier for users to take control of their data and protect their identity.
A source said that Cambridge Analytica has sought additional time of one week to respond to the government notice.
Cambridge Analytica has been accused of influencing the result of the United Kingdom's 2016 Brexit referendum and of the 2016 American presidential election.
The new features follow fierce criticism of the social network giant after it was revealed that the personal data of tens of millions of users was harvested by a British firm.
Cambridge Analytica row: Whistleblower Wylie reveals larger footprint, says SCL gave JD(U) caste data
The controversial firm’s services include providing micro-information that will help political parties win elections.