Facebook boss Mark Zuckerberg has taken out full-page adverts in several UK and US Sunday newspapers to apologise for the firm's recent data privacy scandal.
He said Facebook could have done more to stop millions of users having their data exploited by political consultancy Cambridge Analytica in 2014.
"This was a breach of trust, and I am sorry," the back-page ads state. In the advert, Mr Zuckerberg says a quiz developed by a university researcher had leaked the Facebook data of millions of people. "I'm sorry we didn't do more at the time. We're now taking steps to make sure this doesn't happen again," the tech chief said.
Mr Zuckerberg repeated that Facebook had already changed its rules so no such breach could happen again. "We're also investigating every single app with access to large amounts of data. We expect there are others," he stated. "And when we find them, we will ban them and tell everyone affected."
The ads contained no mention of the political consultancy accused of using the leaked data, Cambridge Analytica, which worked on US President Donald Trump's 2016 campaign. The British firm has denied wrongdoing.