My approach has always been to tread softly when entering online advertising. I test different parameters using small budgets with clearly defined ceilings on what the software can spend, and if there isn’t a return on investment, I stop and find a different marketing channel. I recently became aware of a brilliant social ad campaign being used by an innovative business person I had worked with previously. She had been generating a return on investment of multiple times the ad spend from day one of launching the campaigns.