Cross Site Facebooking

Wrote a review this morning of a restaurant I went to in Boston....As i hit publish and went to close my browser, i saw that there was a pop up box that came up, and went away really quickly....you can see it here as it "runs away".

so the bottom line is that facebook has struck deals with a number of properties to track its users off their core facebook pages, and is publishing key events from those sites in your news feeds....while in this case, i don't have a problem with sharing this info, kind of seems like this should've been on an opt in basis, vs. opt out? no?