According to The Guardian:

“In a sense, Facebook’s defence to the Cambridge Analytica story was more damning than the story itself. Tracy Chou, a software engineer who has interned at Facebook and worked at a number of prominent Silicon Valley companies, agrees that there wasn’t a hack or breach of Facebook’s security. Rather, she explains, ‘this is the way that Facebook works’. The company’s business model is to collect, share and exploit as much user data as possible; all without informed consent. Cambridge Analytica may have violated Facebook’s terms of service, but Facebook had no safeguards in place to stop them.”

The full story may be found at: http://bit.ly/2DKclQS.