Facebook said it would begin reviewing all apps on the platform to determine how they used data and if they respect its privacy rules.
According to a blog-post published by Twitter on Tuesday, the user information that may have been shared without people's permission include country code, details of users' engagement with the ad.
The USD 5 billion penalty against Facebook is the largest ever imposed on any company for violating consumers' privacy.
The Federal Trade Commission said the penalty was the largest ever imposed on any company for violating consumers' privacy.
The same consultancy worked on both the Leave campaign in the UK's Brexit referendum of 2016 and on Donald Trump's election campaign in the same year.
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.