age divide but the information gap about what happened with cambridge analytica. i bet if you asked most people on the street, they have no idea how to articulate what actually happened. and looking to mark zuckerberg to explain that or to clarify the issue, and if they don't get it, how could we possibly legislative -- find a legislative way to solve this problem going forward. one thing that he did mention when testified, it is not just us, facebook. there are social media platforms being used and probably exploited and the fact that mueller is looking into all of these things falls right in line with what his charge is. to figure out whether there was any entity in america or citizen or anyone else about whether somebody was trying to unduly influence our elections and they are a vehicle for do that. >> that is no question that others have this problem, twitter and others, but facebook is the most successful. 2 billion users. if you talk to experts they say the fake news problem was big on