Question

Anyone notice how when you send out an email campaign, the roas in your Fb ad account increases, is Fb taking attribution for email campaigns?

Answer 1

Yes, you’re absolutely noticing something real—and it's a known quirk (or frustration) in Meta's attribution model.

Facebook (Meta) can and often does take credit for conversions that were actually driven by other channels, including email campaigns, if someone clicked or even viewed a Facebook ad within the attribution window.

Here’s how it works:

• Meta uses a last-touch or view-through attribution model (by default), which means:

  • If a user saw or clicked a Meta ad within 1–7 days (depending on your attribution setting), and then converted, Meta will claim partial or full credit—even if the final click came from your email.

So if you:

1. Run a Facebook retargeting ad

2. Send a sales email to the same user the next day

3. They click the email and purchase...

Meta still might show it as a conversion in your ads dashboard.

Why does this happen?

• Overlapping audiences: Your email list and retargeting audience are often the same people.

• Attribution windows: Meta is “watching” for any conversions that happen within that window after a user saw or clicked an ad.

What you can do:

• Use UTM tracking in your emails and analyze results in Google Analytics to separate true email conversions.

• Compare Meta’s numbers to first-click or last-click data in GA to get a better picture.

• Consider adjusting the attribution setting in Meta Ads Manager (e.g., change from 7-day click/1-day view to 1-day click) if over-reporting becomes a serious issue.

So yes—Meta can inflate ROAS during an email campaign. It’s not “stealing” conversions maliciously, but the attribution model gives it more credit than it may deserve. Always good to double-check against GA or your backend analytics.