a, it's not just facebook, i just want to say that up front. when you hear president biden say facebook is killing people -- let's play the clip and hear your reaction since you worked there 11 years. >> they're killing people. the only pandemic we have is among the unvaccinated. and they're killing people. >> how did you feel when you heard that? >> you know, brian, that was a truly stunning thing to hear. obviously it feels terrible to hear the president say something like that. now, i think your point is super important up front that there is a whole ecosystem of misinformation out there. it's important to understand what happens and the impacts of that ecosystem. you know, there's this debate back and forth of what impact is misinformation on facebook around a whole broad array of topics. but today this misinformation on vaccines that we could understand the impact. and that's the important point. there's this saying at facebook which is data wins arguments.