I think you're confusing Adsense with Adwords -- Adsense is the offsite platform Google runs; if Facebook told websites using their non-existent off site platf

I think you're confusing Adsense with Adwords -- Adsense is the offsite platform Google runs; if Facebook told websites using their non-existent off site platform what to advertise to you, that would very quickly turn into a fountain of money