Sometimes you want to direct someone to a specific Facebook Post. Perhaps you've shared some information that you want to promote on a different network, or maybe there's a conversation going on within a post and comments that you want to email one or more other people and direct them to that post. While you could simply share your Facebook Page URL and tell someone where to go on the page, it's far more effecient to send them directly to the post you want them to see. While it's actually really easy to do, it's not immediately obvious just by looking at a post where to go.
Each time you add a new post to your Facebook wall, it will look something like this: