I have ads blocked and avoid using Facebook as much as possible but this insidious ad literally slid out of the bottom of the video I was watching (part way through the video) and would not let me close it or bring up the menu - clicking on either of those things just acted as though I clicked on the ad itself.
Facebook taking shitty advertising practices to a new low.
The X doesn't close - the three dots don't bring up a menu - both of those open the advertisement's URL the same as clicking on the ad itself