I don't care about that. Facebook mistreats its users. Facebook is not your friend, it is a surveillance engine. For instance, if you browse the Web and you see a 'like' button in some page or some other site that has been displayed from Facebook.
Therefore, Facebook knows that your machine visited that page. So, Facebook carries out surveillance over visitors to thousands of different Websites, even for people who are not Facebook users. I hope we will have something for free browsers to block Facebook 'like' buttons so that people won't be under surveillance.
In any case, this is why I ask people not to put photographs of me on Facebook, because Facebook collects data about the names of people in photos. It might as well be working directly for Big Brother.
They all do it in a secret way. Facebook collects a lot of data from people and admits it. And it also collects data which isn't admitted. And Google does too. As for Microsoft, I don't know. But I do know that Windows has features that send data about the user.