It is true that most of our revenues are from advertising. That said, I don't think anyone anticipated from the outset that Facebook would be so successful. Thank you, by the way.
One thing we have talked about often is the degree to which companies that are operating in the space actually face many competitive challenges. You may recall that there was a time not so long ago when people were writing articles saying that Facebook would not be able to make the conversion to mobile and that it would ultimately not be a successful platform.
That is something we oftentimes remind ourselves of, because while we can appreciate that things have been going relatively well, we are very mindful that things can turn on a dime. There was a very key moment just a few years ago, again with this migration to mobile, and the question was that we didn't have an app. You'll recall that Facebook originally was a desktop platform, and there was a big question about whether or not we could make that transition.