Facebook is displaying sponsored post as regular posts to confuse adblockers.
Using different solutions for each browsers and sometime changing algorithm on each refresh, Facebook will try to push this adverts to billions of users.
Specialized applications to block ads are forced to update the code very often and most of the time this sponsored posts from Facebook are successfully displayed to users even they are using block apps.
Facebook Sponsored Remove app has developed an algorithm integrated in browsers add-on or extensions. This app will identify ads from Facebook on all browsers.