couple years. jack dorsey will also talk about the need for transparency, but mark zuckerberg preempted sandberg's visit in the "washington post" saying we've made a lot of progress, but companies like facebook face well-funded, sophisticated adversary who are getting smarter over time, but he says it will take the forces of the private and public sectors to protect america's democracy. are we seeing a combined effort? will we in the future? >> i think we are seeing a combined effort in the sense that we know that on the private side, these companies are created more artificial intelligence, they've invested in more human moderators. imagine that, human beings looking at content and then flagging it. but they are also working closely with private investigators, these cybersecurity firms, and law enforcement. but what we hear from folks like alex stamos, former facebook security executives, that there's not enough investment on the government side. they've been looking at things like the grid. we've gone on for years about the grid. meanwhile, we've had this foreign interference in our