Earlier quoted context omitted.
Both reasons imply an intention to track users. But there is a third possibility. They could have patented it because they are so convinced that user tracking across websites is evil that they want to save the world from it by preventing others from ever doing it. After all a company that has 600 million users has a responsibility to make sure all these people are not put in harm's way. Just imagine how Mark Zuckerbe…
I'd like to try to respond to this, but I can't, because you've gone out of your way to obscure whatever point you have with three paragraphs of ultra-sarcastic nonsense. Fundamentally though, I think your point is, "I don't trust Facebook because of statements and privacy mistakes they've made in the past." That's a fine opinion to have (even though I obviously don't agree with it), so please, for the sake of discus…
And speaking of obscured points, what are you trying to say? Are you saying Facebook is _not_ working on an ad network that does cross domain tracking of users and displays ads based on social graph data, and this is simply a defensive patent? Or are you saying they are developing this feature, but we should trust your company to not abuse it?