Facebook Lead Ads sound like the holy grail of opt-in advertising: they’re completely self-contained ad units available on one of the most widely used websites. They even have existing user data to prefill form field, making it incredibly easy for a user to opt-in and move on. This should keep CPLs low and sign-ups high, but that’s not always the case with Facebook Lead Ads. If you’ve found the lead quality on Facebook to be low, or the cost per lead high, there are other opt-in advertising alternatives that can provide quality leads at scale.