to protect people's data and if we can't do that, then we don't deserve to have the opportunity to serve people. so our responsibility now is to make sure that this doesn't happen again. >> now keep in mind, the 33-year-old rarely puts himself out there for interviews, facebook meantime admitted this week up to 87 million facebook users' private data may have been compromised. that is up from 50 million, now 87 million is the number. how is zuckerberg prepping for this big meeting with congress where he's going to get a lot of tough questions? >> first of all, you know, lots of test questioning. since we had that interview, since we spoke and everyone's wondering where is zuckerberg on this? he's been speaking quite a bit, he did a press conference with reporters and he took all different hard questions from reporters. we have seen sheryl sandberg