Automatic crossposting is a Facebook feature that will automatically present your broadcast on more than one Business Page, even business pages you don't administer. 

Note that this does not apply to Groups, and that comments and reactions will not show up between the cross-posted Business Pages.

Setting up Automatic Cross-Posting on the Facebook Website

Business pages that have crossposting relationships will be listed automatically. Establish cross-posting relationships using the Page’s Crossposting settings on the Facebook website. To find the Crossposting setting, go a Page that you administer on facebook.com. Click the Settings link in the left-hand sidebar (you may need to scroll down in the sidebar), to view the Page’s settings. Once on the Page Settings screen, in the left-hand sidebar, you’ll see Crossposting. (Again, you may need to scroll down to find this.)

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