Facebook wants the internet to know it has changed the way it thinks about ads, charging advertisers only when users actually see an ad, and this rather bold stance could push the rest of ad industry in a similar direction.
Today, with a blog post, Facebook said that it will not charge advertisers if an ad is delivered without being seen. It only deals in “viewed” ad impressions—where users see at least part of an ad—not in mere “served” impressions.