But small town newspapers are endangered by those costs! Facebook only makes about $6 ARPU. Automating the crap out of everything is what enables them to exist.
Elaborating a bit on the sibling comments, Facebook has no "right" to exist as a business. If the only reason it can exist is by ignoring laws with which other businesses are able to comply, it should be shut down (or alternately, forced to obey those laws and then "corrected" out of business by the market).
If a small town newspaper with a staff of 30 can do it, Facebook has both the staff and resources to do the same.
If it cannot, or will not, it should not take advertisements for sectors that are regulated.