I only spent $175 during a 30-day campaign and generated 685 website visits.
From those 685 website visits, we received more than 50 email signups to be contacted for more information.
This is an amazing statistic, and most likely won't happen again.
This was back when Facebook Ads were still extremely under-priced, and I had a very targeted ad campaign. The CPC or cost-per-click was only .25 cents!
The CPL or cost-per-lead was $3.50. Amazing!