Lookalike audience degradation: source quality and refresh
Lookalikes from stale customer lists degrade over time.
Month one lookalike had great CPA, month three junk leads — source audience degraded or audience fatigued. Meta and Google similar audiences need continuous refresh. Audience management on a quarterly rhythm.
Source audience quality
Lookalike source: last 90-day buyers > qualified leads > all visitors. Stale or broad source is main degradation cause.
Minimum source: Meta 100, ideal 1000+. Google customer match 1000+.
- 90-day buyer source
- Qualified lead segment
- Source size check
- Quarterly refresh
Percent and expansion
Meta 1% test, 2-3% scale; 5%+ usually drops quality. Google similar start 5%.
Avoid stacked wide lookalike + broad interest.
Fatigue vs degradation
Fatigue: same creative to same audience — frequency rises. Degradation: source list polluted (staff, bots).
Exclude customers, staff, low LTV. Creative rotation for fatigue.
Refresh calendar
Quarterly new source list upload; kill old lookalike, test new. A/B old vs new 2 weeks.
Tourism season start: last year's guests as new source.
Value-based lookalike
High LTV or order value subset as source — improves ROAS.
Export RFM segment from CRM.
Measurement
Lookalike ad set CPA trend over 8 weeks. Sudden break: source or creative — split test.
Don't confuse with wrong targeting.
Lookalikes aren't static — source and refresh discipline required.
Refresh audience architecture with paid ads. Contact us.
