This is bogus, and a slight of hand meant to further erode privacy while giving Facebook an argument to fall back on other than "it's in our interest to post everything you do into our stream."

The bottom line is that what is actually going to happen here in the real world is that people are going to connect their Facebook account to these web sites, not realize or forget (yes, people forget these things) that this web site has been given the keys to the castle to post whatever it wants on their behalf, and a ton of shit is going to get posted to the internet that was beyond the intent of the user originally clicking buttons just to get past an annoying confirmation dialog.

That said, the people fighting against this are fighting a losing battle. Facebook is basically going to control the world unless someone comes in and tries to beat them at their own game and impose their own vision of how and when information like this should be shared.