up and profitable for the creators. >> every time we click and share, they make more money. >> now they're banning fake sites from making money off their ad networks. it's a first effort to choke off some of the revenue. the bigger challenge, providing more b.s. detection tools without threatening free speech. >> suddenly, they have these, i think, societal duties to help us not be be faked out all the time. yet, i don't want the terms of service of one or two or three companies to have more influence than the first amendment. >> the root problem is that some people want to believe the lies. that's why the responsibility isn't just facebook or google or twitter's. we all have to get a little smarter about what we share. >> we have to be relentlessly skeptical of absolutely everything. we have to go outside of our