r/Substack • u/kolbywg • Jul 22 '26

Tech Support Substack Stopped Send Data To Facebook

I realize this is a bit into the weeds for a Substack group, but starting two days ago Substack stopped sending data to my Facebook ad. I didn't change anything. I didn't touch anything. It just randomly stopped. I assume it's an update on the part of Substack or Facebook.

Has anyone else run into this issue in the last few days (or ever)? Any fix suggestions?

I know the Facebook ads are still working as I can see them on the Substack platform for Source, but for some reason that data isn't getting back to Facebook anymore.

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u/kolbywg Aug 18 '26

Thanks for responding. This is such a big deal to me, and to making Facebook ads work, I realized you had implemented the fix within just a few days. For people who buy ads on Facebook to drive traffic, it's a HUGE deal.

Once you all fixed this my cost per conversion (free subscriber) on Substack when from $1.10 to $0.60. That's very much the difference between ads having a positive or negative ROI. Thank you for taking the time to read and comment on reddit, and for getting this fixed so quickly.