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Security, on protecting peoples privacy. thats something that lawmakers, particularly on the senate side here, very much want to hear from him. this has been sort of a hot commodity to get zuckerberg himself in front of these senators, who want to ask him tough questions and sort of get these kind of commitments from him on the record, on camera, which has not been done up until these last few weeks, guys. >> garrett, were looking at live pictures on the left. theres mark zuckerberg. hes going t...