Thank you for you comments, and particularly about your use of Facebook. I also use Facebook very frequently to communicate with my family and friends, and find it valuable. As we've said before, we have a very significant responsibility as well to make sure that people using our service are able to use it in a safe and protected way. That's been important for a long time, but we're continuing to invest in it.
With regard to application developers, first, we have a series of restrictions on how they can use information from the platform, including that they can't ask for information they don't need to operate their apps. They can't sell information they receive. They can't use it for monetization or app networks or those kinds of things. They have to delete the information if we or somebody else asks them to do so.
As a part of the changes we made in 2014, we introduced an upfront review process, so that apps that wanted to get access to our platform and to get those additional pieces of information would have to go through an upfront review. We also do a reactive review when we identify a problem. Those steps can include removing somebody from the platform, investigating what they're doing or—