We are talking about a new style of Facebook link that has built-in tracking parameters, so that when you click through to a page on Facebook it gets logged in

We are talking about a new style of Facebook link that has built-in tracking parameters, so that when you click through to a page on Facebook it gets logged in connection with how you got there. If someone never visits Facebook, this new style of link does not affect them. I agree that Facebook also collects data in other ways, but this is entirely unrelated.