Mark Zuckerberg's statements to Congress today included the remark that, “I don’t believe we’ve ever collected the content of phone calls.” This is somewhat misleading. Facebook has collected records on phone calls and SMS messages made by Android users. See this post to the FB blog. While it apparently does not collect the same information from people who install the FB app on their iPhones, the data I downloaded from my FB account includes all of the contact information on my iPhone.
Android users of the FB messaging app, may receive a notification like this one requesting to, "Continuously upload . . . your call and text history."