While creating a Facebook post under the "Additional Settings" section, you have an option to schedule the post on Facebook, too.

Simply click on "Schedule on Facebook" and the post will automatically appear in the Facebook Publishing tool. You can later see it in the "Scheduled posts" section on your Facebook page.

"Schedule on Facebook" feature enables you to generate URL for this post before publishing it, which you could use to create Facebook ads before the scheduled time. 

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