Facebook founder Mark Zuckerberg has admitted the company made mistakes in dealing with the private data of its users. In a Facebook post Wednesday, Zuckerberg apologized and said the social media service is already taking steps to prevent misuse of user data in the future. “The good news is that the most important actions to prevent this from happening again today, we have already taken years ago,” Zuckerberg said. “But we also made mistakes, there's more to do, and we need to step up and do it.” The apology came after news reports said a British company was able to secretly collect private information on more than 50 million Facebook users. The information was reportedly given to the company, Cambridge Analytica, by a researcher at Cambridge University named Alexksandr Kogan.