Not just the same domain, they'll likely serve the ad assets from the same location as the standard Facebook assets. So images from the same place they serve p

Not just the same domain, they'll likely serve the ad assets from the same location as the standard Facebook assets. So images from the same place they serve profile and photo assets. Javascript will likely be a single JS file with both the Facebook JS (required for FB to work) and the ad JS. The individual ads will likely be within elements that change id and class so those can't be blocked either.