https://www.theguardian.com/technology/2018/mar/29/facebook-logged-sms-text-phone-calls-users-complain

Users complain of phone and text data collected by the company despite never having agreed to practice

Facebook began logging the text messages and phone calls of its users before it explicitly notified them of its practice, contradicting the company’s earlier claims that “uploading this information has always been opt-in only”.