Old school newspapers would refuse to run ads that broke employment laws. And I've never heard of them bellyaching about policing that.

But Facebook is somehow how different? Why?

Oh right their business model doesn't work if they have to pay the costs associated with following government regulations.

I'm not feeling sympathetic.

I'm not saying facebook shouldn't police their listings. But were old school newspapers legally required to do that?

I'm asking, are we wanting facebook to do it because it's ethical? Or are we wanting to legally require them to?

It can be simpler than that. The government has already ordained and required the laws. If Facebook publishes an illegal ad, the government should enforce those laws and punish Facebook.

It's up to Facebook to take whatever internal steps they deem necessary to prevent that from happening. The government doesn't need to decide what steps need to be taken -- it only needs to care about the outcome.