Users' Friend data, which was used by OfA, was not explicitly given by those Friends. Yes, Facebook's user agreement allowed them to do that. But I'd bet most

Users' Friend data, which was used by OfA, was not explicitly given by those Friends. Yes, Facebook's user agreement allowed them to do that. But I'd bet most people didn't consider that by signing up for Facebook, their personal profile data could be given to political campaigns without their knowledge, if any of their friends consented to it.