As Facebook got mired into its biggest-ever controversy, its CEO Mark Zuckerberg on Wednesday admitted that the social media giant “made mistakes” over the Cambridge Analytica scandal and a “breach of trust” had occurred between it and its users.

“I want to share an update on the Cambridge Analytica situation — including the steps we have already taken and our next steps to address this important issue. I’ve been working to understand exactly what happened and how to make sure this doesn’t happen again,” the CEO wrote on Facebook.

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“The good news is that the most important actions to prevent this from happening again today we have already taken years ago. But we also made mistakes, there’s more to do, and we need to step up and do it,” he added.

Facebook is facing the heat after Cambridge Analytica, a British consulting company, was accused of harvesting data of up to 50 million Facebook users without permission and using the data to help politicians, including US President Donald Trump and the Brexit campaign.

European Union (EU) and British lawmakers have demanded that social media giant Facebook should clarify data breach following revelations that personal data was massively misused for political purposes.

In his post, Zuckerberg gave a timeline of events that happened since the inception of the platform, saying there is a need to do more.

The company would investigate all apps that had access to large amounts of information before it changed the platform to dramatically reduce data access in 2014 and conduct a full audit of any app with suspicious activity.

“We will ban any developer from our platform that does not agree to a thorough audit. And if we find developers that misused personally identifiable information, we will ban them and tell everyone affected by those apps,” he said.

He said Facebook would restrict developers’ data access even further to prevent other kinds of abuse.

“Third, we want to make sure you understand which apps you’ve allowed to access your data. In the next month, we will show everyone a tool at the top of your News Feed with the apps you have used and an easy way to revoke those apps’ permissions to your data,” he said.

Facebook already has a tool to do this in privacy settings and now it would put this tool at the top of the News Feed to make sure everyone sees it.