whatever standard applied likely he list its the most engagement from users on your site and for google increased engagement potentially means increased revenue. however, it is important for google to make very clear where it draws the line and i don't believe google has done its best to make that clear. so what i would ask is the following, would google or youtube be willing to make changes in support of a healthier civic dialogue if doing so meant a drop in user engagement metrics? >> absolutely, mr. chairman. we have always focused on long-term goals to user satisfaction. we focus on their knowledge, happiness, success and that's what we work hard to create. it is important to us that platforms like youtube are viable over the long run. it is a natural incentive to do so. youtube is a place that users, advertisers and content creators who make their livelihood use the platform.