I will be running a giveaway on Instagram in honor of Small Business Saturday. The way people enter is to tag someone in the comments and they can tag as many people as they want in separate comments. I would love to set up an automation where they will receive a link to subscribe to my email list after they’ve commented, but I’m worried is someone comments more than once they will receive duplicate links for my email list. How can I avoid that?
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Hi,
There's a limitation from Meta that only allows ONE comment trigger per user on a Post/Reel. This means that you can build your automation without the fear of one user triggering the automation many times.
But if you set a trigger to all your posts, if the user comments in another post, it will trigger again. 
Hope it helps and good luck on your campaign!
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