Companies the spend the most on Facebook ads track the resulting revenue they earn very closely.
So even if lots of clicks were fraudulent, they're looking at ($ earned from clicks)/($ spent on clicks). Based on Facebook's continuing increase in earnings, it's safe to bet that lots of major advertisers are seeing this ratio returning >1, and are therefore increasing their spend.
So even if lots of clicks were fraudulent, they're looking at ($ earned from clicks)/($ spent on clicks). Based on Facebook's continuing increase in earnings, it's safe to bet that lots of major advertisers are seeing this ratio returning >1, and are therefore increasing their spend.