Wadhwa points out that while WhatsApp itself claims to have end-to-end encryption through which it protects a user's privacy, it did confirm that it shares phone numbers, device identifiers, operating system information, control choices and usage information with the "Facebook family of companies".
Saying that Facebook was a "tech" company, Zuckerberg said he planned to have third-party developers use the website to build their apps and services, similar to how people can write programs and apps for Windows.
"However, this is not considered sufficient to assure the security of data once users have third-party apps enabled".
"What we try to do is send the person at Facebook who will have the most knowledge about what Congress is trying to learn", he said in an interview with CNN this week.
The market value of the company has dropped by nearly Dollars 58 billion within the span of one week, after news spread that it failed to maintain user data privacy, allowing the firm Cambridge Analytica to siphon the personal data of over 50 million users. "We're now taking steps to ensure this doesn't happen again", Zuckerberg writes, adding that the company has already "stopped apps like this from getting so much information".
Kogan paid about 200,000 people to take part; tens of millions of their friends were also caught in the data dragnet. It is this data dump that reveals the extent of Facebook's data harvesting - surprising even for a company known to gather huge quantities of personal information.
Cambridge Analytica CEO Alexander Nix was caught bragging about the firm's pivotal role in the Trump campaign on a sting video from the U.K.'s Channel 4.
It has been a tough week for the social networking giant Facebook.
The Cambridge Analytics fiasco appears to have crystallized the anxiety many people feel about Facebook's enormous sway over daily life and its massive data trove.
Elizabeth Denham, head of the ICO, sought the warrant after a whistleblower said Cambridge Analytica had gathered private information of 50 million Facebook users to support Donald Trump's 2016 US presidential campaign. Now we're limiting the data apps get when you sign in using Facebook.
"Make no mistake Facebook is an awesome medium from the advertiser's point of view because of the accuracy of its targeting - which comes from data".
Zuckerberg said Facebook will now audit thousands of apps on its website that have large amounts of data, according to The Washington Post. It has also suspended the access of Kogan and Wylie, as well as Cambridge's parent company, SCL.