I'm also surprised publishers are going along with it though, it seems a little ironic. The only reason this product is interesting is because so many mobile articles today have horrible UIs. Native views will probably be nicer anyway but publishers could mostly fix this right now if they were willing to give up my accidental ad clicks. But instead they need someone like facebook to save them from themselves in order to make their content consumable again.
RSS readers solved this problem a long time ago.
It's activated by clicking the icon or by using a keyboard shortcut (cmd+shit+x). So there is at least one single way to close any overlay on any website.
And, no, I don't feel guilty - I might have felt guilty if I only paid for ads with my attention (I'm not sure though - I don't feel guilty ignoring the ads on a print newspaper). But allowing ads through means you give 20 or so organizations with questionable ethics complete info about your web use, including (but not limited) to when and what -- and those 20 organizations sell that info to the highest bidder. No, I don't feel guilty at all.
And facebook is one of those questionable ethics organizations I mentioned. The mere existence of a "Like" button (whether you click it or not) in 99.99% of the cases already gives facebook all the info about your surfing habits.
You can find the article on facebook, or when you searched bing, or maybe even subscribe to their newsletter, get mobile notification from their mobile app on your phone.
And how is this publishers relinquishing their control? They will post on facebook no matter what. Integration with the platfrom gives them more data and another possible monetization stream with more perks on the way, I'm sure. What are they losing from this integration?