Interesting that cost per ad went down. I wonder what happened to the click-through-rate as users had so many more ads shoved in their faces. It's possible tha

Interesting that cost per ad went down. I wonder what happened to the click-through-rate as users had so many more ads shoved in their faces. It's possible that ads are now cheaper, but also less effective. I only ever did pay per click because impressions mean nothing to a startup that no one has ever heard of. But it was always hard to break out of the default settings that were pay per impression.