NEW YORK — In the wake of the Cambridge Analytica scandal that broke this week, Facebook founder Mark Zucerkberg took out full-page ads in major American and British newspapers on Sunday to say “I’m sorry.”

In the U.S., the ad appeared in The New York Times, The Washington Post and The Wall Street Journal as well as the The Sunday Times and The Sunday Telegraph in the United Kingdom. 

“We have a responsibility to protect your information," the Zuckerberg ad says. "If we can't, we don't deserve it."

"You may have heard about a quiz app built by a university researcher that leaked Facebook data of millions of people in 2014," Zuckerberg wrote. "This was a breach of trust and I'm sorry we didn't do more at the time. We're now taking steps to ensure this doesn't happen again. We've already stopped apps like this from getting so much information. Now we're limiting the data apps get when you sign in using Facebook.

"We're also investigation every single app that had access to large amounts of data before we fixed this. We expect there are others. And when we find them, we will band them and tell everyone affected. Finally, we'll remind you which apps you've given access to your information - so you can shut off the ones you don't want anymore."

He went on to make a promise — to do better:

"Thank you for believing in this community," Zuckerberg wrote. "I promise to do better for you."

Facebook announced last week it was suspending Cambridge Analytica's account over violating policies after it was reported it harvest the personal information of more than 50 million Facebook users.

Facebook’s stock value has dropped more than $70 billion since the revelations were first published.

Cambridge Analytica got the data from a researcher who paid 270,000 Facebook users to complete a psychological profile quiz back in 2014. But the quiz gathered information on their friends as well, bringing the total number of people affected to about 50 million.

The Associated Press contributed to this report.