"But I am committed to getting this right, and that includes the basic responsibility of protecting peoples information, which we failed to do with Cambridge Analytica", he said. More recently, its permission request asks users if they want Facebook to "Continuously upload info about your contacts like phone numbers and nicknames, and your call and text history".
In prepared remarks released on Monday, the Facebook chief made clear that business as usual is not an option.
"We need to take a more active view in policing the ecosystem and watching and looking out and making sure that all the members in our community are using these tools in a way that's going to be good and healthy".
Senator Charles Grassley, chair of one of the committees holding the hearing, said the scandal involving the British firm Cambridge Analytica "was clearly a breach of consumer trust and a likely improper transfer of data".
Poner el ejemplo desde arriba, ofrece López Obrador
El candidato llamó hipócritas a los panistas que hoy critican al Tribunal, tras recordar que los Magistrados fueron designados como producto de un acuerdo entre el PRI y el PAN.
Those with affected accounts will see a notification at the top of their Facebook News Feed, informing them how they are affected.
Another lawyer in the case, Jason McCue, said "the defendants effectively abused the human right to privacy of ordinary Facebook users". Facebook, Zuckerberg said, hasn't thought about its responsibility to users broadly enough, until now.
More: Facebook's Mark Zuckerberg has promised to protect user privacy before.
Zuckerberg said Facebook will increase the number of staffers working on security and content review to 20,000, and it will also use artificial intelligence to monitor the spread of fake news.
It was a rare moment when the senators, who had an average age of 62 according to Vox, weren't being mocked. "I would probably not choose to do that", he said.
Asked if Facebook executives have been interviewed by special counsel Robert Mueller, who is investigating Russian interference in the US election: "Our work with the special counsel is confidential".
Amenaza Trump con misiles a Siria
La guerra en Siria entre los kurdos y el gobierno de Bashar Al Asad sigue siendo un conflicto importante para el control de la zona.
"I believe in what we're doing", he said.
He was also asked about the alleged abuse of the social media platform by Russian groups to interfere in the 2016 US presidential elections.
"Would you agree to an opt-in instead of an opt-out?"
The company moved so quickly that Zuckerberg didn't always have time to think through potential negative consequences of product upgrades and changes.
Others deliberated as to whether or not the Facebook mogul was self-conscious of his 1.71 metre height. And that's too dangerous a situation for us to allow to carry on.
Rusia saluda que OPAQ envíe expertos a Duma, Siria
Explicó que la invitación ha sido enviada a través de los representantes permanentes del país árabe en La Haya, donde la OPAQ tiene su sede.