"Pin this post" means to select or mark a specific post, usually on a social media platform, so that it remains at the top of a profile or page, making it easily visible to others.
Sentences with «to pin this post»
Be sure to visit these sites individually to see all these amazing ideas and how - to's and then pin this post for later! (simplydesigning.porch.com)
To pin a post on your Page, click on the small down arrow in the top right corner of a published post. (hubspot.com)