I'm surprised. I thought Facebook would have been somewhat effective. Can anyone point out any use cases of when Facebook and Google work and don't work? FWIW

I'm surprised. I thought Facebook would have been somewhat effective. Can anyone point out any use cases of when Facebook and Google work and don't work? FWIW my dad ran a few FB ads for his SME and it was alright, although nothing stellar either. He didn't run on Google though so I can't really draw a comparison.