Cybersecurity researcher Dave Walker discovered that Facebook CEO Mark Zuckerberg was among the 533 million users whose personal information had been leaked over the Internet after the newly discovered Facebook hack.

"Regarding # FacebookLeak, of the 533 million people in the leak, the irony is Mark Zuckerberg is unfortunately included in the leak as well," Walker wrote on Twitter.

In another turn of events, Mark Zuckerberg also respects his own privacy, by using a chat app that has end-to-end encryption and isn't owned by @facebook

This is the number associated with his account from the recent facebook leak.

https://t.co/AXbXrF4ZxE

- Dave Walker (@Daviey) April 4, 2021

Walker covered part of Zuckerberg's number, but said he found that the leaked Zuckerberg's phone number was linked to an account for Signal, the chat app that contains end-to-end encryption and is a direct competitor to WhatsApp, which is owned by Facebook.

The problem was corrected, a company spokesperson confirmed to Mashable.

But the spokesman did not comment on whether Zuckerberg's information was among the data that were leaked.

Signal asks Zuckerberg to emulate

In response to Walker's discovery, the Signal app enjoyed this news, tweeting, "With the approaching deadline for accepting WhatsApp's terms of service on May 15, follow Mark," in an invitation to the public to switch to Signal, as did WhatsApp chief Mark Zuckerberg.

With the May 15th WhatsApp Terms of Service acceptance deadline fast approaching, Mark leads by example: https: //t.co/Mt5YksaAxL

- Signal (@signalapp) April 6, 2021

The updated privacy policy for WhatsApp - which was initially scheduled to be implemented on February 8th, but was suspended after a public backlash - includes changes related to how data is collected and used.

Users who do not accept WhatsApp changes will not be able to read or send messages, but will be able to receive calls and notifications for a "short period".

Tweeters mocking the president of WhatsApp

And Mark Zuckerberg, founder of Facebook, was exposed to a wide wave of ridicule on communication platforms, after discovering that he had used Signal, a competitor of his company's messaging application, "WhatsApp."

Walker said in another tweet that "Mark Zuckerberg respects his privacy by using the Signal application, which is not owned by Facebook, which guarantees encryption of the conversations that take place between the two parties to the chat."

Tweeters expressed their mockery after discovering that the Facebook founder used the competing Signal application, noting that it is an example of lack of confidence in its application and the need to move immediately from WhatsApp.

On the other hand, others expressed their admiration for the way Signal exploited the matter, stressing that they were distinguished in presenting themselves in creative ways over the past period, in addition to their excellence in maintaining the privacy of users.

HILARIOUS.

It's official.

Everyone really * is * leaving Facebook-owned WhatsApp for Signal.

Including Mark Zuckerberg.https: //t.co/o8fCVeEAbg

- Carole Cadwalladr (@carolecadwalla) April 6, 2021

Technical journalist Abhishek Baxi tweeted, "Well played! Although he might just be around to make a takeover bid or create a pool of inspirational ideas."

Journalist Carol Cadwallader also said in a tweet, "Very funny, everyone is really officially leaving the Facebook-owned WhatsApp app, including Mark Zuckerberg."