cross-post
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Facebook's Accounts Center lets you cross-post to Instagram
You can use it to sign in to both accounts and Messenger at the same time.
Facebook's experimental Stories feature lets users cross-post to Instagram
Facebook has started testing a feature that will finally allow you to cross-post Stories to Instagram. The social network released a tool that gives you the capability to cross-post Instagram Stories to Facebook way back in 2017. However, that tool has no capability to cross-post the other way around. App researcher Jane Manchun Wong has discovered the experimental "Share Story to Instagram" toggle within the Story Privacy settings, and switching it on activates a "Share to Story" button.