Oddly, the Facebook police are rabid about editorial comments that don't support their agenda. However, scams are rampant throughout the site. Perhaps it's the fact that the scammers are paying money to place their ads, such as the one you noted.
graybeard wrote:
I refer to these many items that one sees on Facebook, such as "we are overstocked/going out of business/feeling generous" ads offering a new CANON or NIKON camera with 3 lenses, 2 batteries, 2 memory cards, tripod, bag etc for $99 !!! Is there anything to this ?? or is it some kind of come on, and how does it work?