Why does FB need this data? Isn't it enough that they track clicks, and they (should) know exactly where that link or button is placed in the user's current viewport?
I guess scrolling is important to know, in terms of how much time you spend looking at what's currently visible in the view port, and that the number of times you trigger the infinite scrolling is not granular enough to figure out which of the previous 10 items you spent the most time on (and didn't click through).
I guess scrolling is important to know, in terms of how much time you spend looking at what's currently visible in the view port, and that the number of times you trigger the infinite scrolling is not granular enough to figure out which of the previous 10 items you spent the most time on (and didn't click through).