bloomberg check's kurt wagner joins us. jack dorsey at square has made a big bet on crypto, why is twitter making this move? kurt: they want to give people a chance to make money to entice them to twitter to share blog posts, tweets, photos, whatever, and accepting bitcoin is one way to do that. this is important to jack dorsey. he believes that coin is an international currency. it is the way someone who lives in africa might be able to pay someone who lives in europe, who could pay someone in the united states. you don't have to deal with a currency exchange. this is a global solution to try -- they see this as a global solution to get users of their platform to make money. emily: how many people are tipping on twitter at this point? kurt: they just rolled out globally today to only ios users. if you are on android, you probably don't have it. it is probably a small percentage. tips people get are probably pretty small but this is the kind of thing you see other platforms that are important with creators have. i think this

emily: bloomberg news' kurt wagner. thank you for your insight.ow to other don't about the lula -- electronic arts has a new chief operating officer, making her the most powerful woman in videogaming. the promotion sends a message at a moment when the industry is facing an uprising against sexist culture in the gaming industry. rival blizzard facing litigation over alleged sexual harassment of women. coming up, how much trouble is facebook in? more on senators grilling and what it means for the future of social media impact on a generation of children. that is next. this is bloomberg. ♪ >> the question that haunts me is, how can parents, or anyone, trust facebook? >> you have lost trust. we do not trust you. with influencing our children. emily: senators blumenthal and blackburn grilling facebook's antigone davis about internal research on the effects of its platform on teens and children. the senator saying this is a -- issue. the accusation that facebook new their product had a negative impact on teen's mental health. joining us is adam cover sa

emily: kurt wagner, thank you so much for your reporting. i want to get more from mark mahaney, the head of internet research. a lot of facebook developments. this is a pretty big deal. he's been there a long time, his guess is right next to that his desk is right next to mark zuckerberg and sheryl sandberg. ? is it a good sign? >> not necessarily. he eventually came back to the company, chris coxe, it reminds me of that. it's not the first time we have had one of the original people with the firm step down. maybe it is natural -- you mentioned others who have left. i don't think it is negative. i think it is the national evolution of people being there. a dozen years is a long time for a company. i think it is someone who had his time, is ready for a new challenge, it might be exhausted. i don't see it is negative for the company. emily: facebook warning that the apple add tracking issues can have an impact on revenue. how big an impact are you forecasting? >> this is an odd one. there was a blog put out by one of the marketing managers rei