Hello,
I want to use my Lookalike audience created from a thank you page for targeting.
My question is if using that LAA automatically excludes all the customers from the custom audience list
I used to create the LAA or if I need to exclude them separately?
Because if I exclude them separately then Facebook can't estimate the reach of the campaign anymore.
Thanks
It automatically excludes the customers.
However, that thing about Facebook not being able to estimate the reach - that's a bug. We see that a lot. Or maybe its Facebook shielding that info from you. They're paranoid lately with CAs and LLAs after the Cambridge Analytica disaster. You'll still get traffic from Facebook regardless if you launch it.