It would be incredibly presumptuous and self-serving of me to believe that Facebook was the end of history. The only way it could possibly be the end of history is if it becomes some sort of artificial super intelligence that takes over the world. ↗
That's the power behind a tool like Facebook Connect. It is making a Web without walls. Facebook allows you to go to other sites to comment, rate, etc., without having to set up a new profile for that site. ↗
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. ↗