Facebook or any network that gets your URL and displays preview, actually scrapes the URL through a system developed by Facebook called the open graph. They might look something like this in the page's source, <meta content='https://howtoblog.krishnainfotron.com/2016/08/facebook-og-object-debugger.html' property=' og:url '/> <meta content='Blogger & Facebook OG object debugger' property=' og:title '/> <meta content='My Facebook preview shows incorrect information. How to fix?' property=' og:description '/> Therefore, while sharing a link for the first time on facebook, the object debugger stores meta information like these in its cache so when you share again, instead of scraping the URL, it takes from its own cache. After a while, when the cache expires, it scrapes again. So a shared URL even upon changing the description/image/title, does not get affected immediately. It doesn't mean, there's no ot...