The former Connecticut attorney general displayed what his staff called a previously undisclosed 2014 agreement in which Facebook granted the researcher at the center of the Cambridge Analytica scandal permission to sell data collected from Facebook users through a survey. Facebook has claimed it was deceived by the researcher, whose survey was used to collect data on up to 87 million users. Blumenthal asked if the document violated a 2011 consent decree on improving user privacy that Facebook reached with the Federal Trade Commission. Zuckerberg said no, but also said the document was "in conflict" with Facebook rules. Blumenthal decried Facebook's "willfull blindness" and insisted it will only change its ways with strict regulation.  5:40 p.m. Facebook CEO Mark Zuckerberg is assuring lawmakers he has learned a lot since starting the social network in his Harvard dorm room 14 years ago. The roughly 2.2 billion people now using Facebook can only hope Zuckerberg's views on personal privacy have changed.