Facebook's ad platform is very mature, it was launched in 2007. I think Facebook is able to let more questionable stuff run in part because the micro-targeting

Facebook's ad platform is very mature, it was launched in 2007. I think Facebook is able to let more questionable stuff run in part because the micro-targeting makes it easy to disperse bad stuff to narrowly targeted audiences. On Google, investigators could search well known pharmaceutical terms and it was plain as day the advertisers were breaking US law. It is kind of like putting crack for sale in your storefront window verse in the back behind a maze of doors. From what I have heard first hand, Facebook's platform was much more difficult initially and now is more lax. This could be in part the sheer scale of their ad network and the difficulty in policing it, or everyone figured out which loopholes Facebook couldn't plug without screwing up their quarterly numbers.