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When you create a new ad in the Campaign Launcher, the default flow is to upload images or videos and let the system create new ad posts. But if the content you want to run has already been published as a Facebook post — and has accumulated social proof (likes, comments, shares) — you can use that existing post as the ad creative instead of creating a new one. Using existing post IDs preserves social proof. An ad running from a post that already has hundreds of comments and reactions performs differently — and often better — than a brand-new post with zero engagement.

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How to Use an Existing Post

At the Ad level, after selecting your Facebook Page and Instagram Account, you will see a selector with two options: Create an ad (the default) and Use an existing post. Select Use an existing post.
Use existing post — browse posts or paste a Post ID
Two ways to find and add posts:
  • Browse posts — opens a searchable panel showing all posts available to the selected ad account. You can search by post ID, message text, or other post elements. The list shows post type (image, video, etc.), whether it is a published or ads post, share count, and creation date.
  • Paste a Post ID — if you already know the post ID, paste it into the field and click Add.
Select one or more posts. Each post selected creates a separate ad — the same way each uploaded image or video creates a separate ad in the standard flow. Set the Call to Action for these ads.

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Using Groups with Post IDs

The group mechanism is available in the existing post section as well. This lets you create batches of post-based ads with different settings — for example, one group using “Learn More” as the CTA and another group using “Shop Now”. Each group generates its own set of ad variations from the same posts, letting you test CTA performance while preserving the social proof on each post.