sandberg indicatee today show that facebook users who do not want their personal information used for advertising might have to pay for that protection. pay for it. are you actually considering having facebook users pay for you not to use that information? >> senator, people have a control over how their information is used in ads in the product today. if you want to have the experience where your ads aren't targeted using all the information that we have available, you can turn off third party information. what we found is that even though some people don't like ads, people really don't like ads that aren't relevant and while there is some discomfort for sure with using information and making ads more relevant, the overwhelming feedback that we get from our community is that people would rather have us show relevant content there than not. so we offer this control that you're referencing. some people use it. not the majority of people on facebook. and i think that that's a good level of control to offer. i think what sharyl was fai wasg in order to not run ads at all we need another