Blog Not Updating Featured Image / Copy

I have deleted and changed the featured image, url, title, everything I can think of, but the blog is not updating when I paste the url into FB or other networks. The snippet for the post and the featured remain the same from the previous post. I do not have a cache plugin running, cleared my computer’s cache, and also tried it on several devices that hadn’t been to the website but it still did not update. I have no idea why or what to do about it.