so, brian, what else do viewers need to know? is there something we're leaving out here or something else that viewers need to know about what you said is a very hard problem and lack of transparency makes it harder? >> yeah. look, i think people need to understand that these are incredibly complex issues. when you're the person who's inventing the ship, you're not dreaming of the shipwreck. part of the problem is that there are optimists are building these things that don't dream of the bad outcomes. and we have great entities in the world that are really good at researching things and understanding the bad outcomes. the things that facebook can't dream of that are going to go wrong on the platform. this global community could really play a role in shaping things. it's not just the u.s., think about every country that facebook is in and every language and every context. that's incredibly hard. and if we don't have the companies being transparent, then we need to look at ways to create regulation around helping them be transparent. be clear of what information we