To do Facebook Custom Audience Email/Phone Matching BY ITSELF we need 20,000 emails or phone numbers to start. If the client doesn’t have that many then we can combine it with a Lookalike Audience. If we are doing the two products together then we only need 500 matched emails or phone numbers. Facebook usually has a match rate of about 50% so figure you will need at least 1,000 to start.
To do Facebook Lookalike Audience BY ITSELF we only need 100 matched emails or phone number so a starting list of at least 200.
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