Facebook's chief
executive apologized after 50 million users' data was mishandled by the
political consultancy firm Cambridge Analytica, which improperly accessed user
information to build profiles on American voters. “This was a major breach of
trust. I’m really sorry this happened. We have a basic responsibility to
protect people’s data,” Mark Zuckerberg said. He added that they plan to conduct an
investigation of thousands of apps that have used Facebook’s platform, restrict
developer access to data, and give members a tool that lets them to disable access
to their data more easily.