M19highMeta AdsAudience overlapPass<20% overlap between active ad setsWarning20-40% overlapFail>40% overlap between ad sets
M20highMeta AdsCustom Audience freshnessPassWebsite Custom Audiences refreshed within 180 daysWarning180-365 days oldFail>365 days old or not created
M23highMeta Ads~10 min to fixExclusion audiencesPassPurchasers/converters excluded from prospectingWarningPartial exclusionsFailNo purchaser exclusions from prospecting
M24highMeta AdsFirst-party data utilizationPassCustomer list uploaded for Custom Audience + LookalikeWarningList uploaded but not refreshedFailNo first-party data uploaded
M21mediumMeta AdsLookalike source qualityPassLookalike source ≥1,000 users from high-value eventsWarning500-1,000 usersFail<500 users or low-value source
M-TH1lowMeta AdsThreads placement evaluationPassThreads placement reviewed (GA Jan 2026, 400M+ MAU). Lower CPMs but only ~0.04% of ad spend in Q3 2025. Worth testing for incremental reachFailNot evaluated