When you create an Instagram ad by promoting a post or story, you can choose a destination for your ad. This tells Facebook where you’d like to send people to when they’ve tapped on your ad. One of the destinations is – Instagram direct i.e your Instagram inbox.

Instagram Ads with this destination will include a call to action to send your Instagram business account a direct message. People that interact with your ad and tap your call to action (send message button) will be prompted to send a message to your inbox on Instagram.

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https://icoquet.com.ng/create-instagram-ads-that-let-people-send-message-to-your-instagram-inbox/