If I might add with regard to advertising specifically, as you point out, that it is an important part of the service in part because it allows people to use Facebook for free, but also because good, relevant advertising can be valuable to people. I think we have a responsibility to build our advertising business in a way that also protects people's privacy. For example, an advertiser can tell us that they want to reach people who are 18 and over in Ottawa who are interested in cars. Then we can deliver the advertisement to those people without providing those people's private information back.
On April 19th, 2018. See this statement in context.