This scam isn't anything to do with facebook privacy.
The scam is standard redirect, that can be applied to any web page. Basically it is nothing more than you think you're clicking to watch the video, but you are actually clicking the 'like' button.
There is no video, hence why the OP has never watched it. But he has tried to watch it. And in doing so, he clicked the 'like' button, he just didn't know it!
Correct, there is no video, but that doesn't stop the fact that as stated in the opening post, someone's been accused of watching something that they haven't watched, regardless of whether this content exists or not.
You're also ignoring the underlying issue with the way that Facebook is setting itself up, with regard to the fact that with it's new plugin technologies, it's attempting to track the browsing activity of every facebook member regardless of what websites they're viewing.
Remember the "scare" a while back when Facebook were logging and tracking the browsing habits of any member who viewed a page that had had a "like" button placed there by the website? Now they have the ability to have your browser put a "Like" button on every website, allowing them to literally view your every internet move.