It is definitely not moderated, I've had multiple plugins inject ads into my web browsing. One was a Facebook app to enlarge photos and it started adding these

It is definitely not moderated, I've had multiple plugins inject ads into my web browsing. One was a Facebook app to enlarge photos and it started adding these banners to the sides of facebook. I though it was Facebook using a new form of ads until I realized otherwise. I had another do it on yelp...