title: How can I force Facebook to purge its cache and use newer meta description of a shared webpage?
body: <p>Facebook fetches the title and webpage description from the HTML header of the webpage whenever people share a link on Facebook. I realized that [I believe for performance purposes], Facebook caches and reuses the webpage title and description if more people share the same link over and over again. What if the webpage has a breaking news or something that is dynamically changes within a short period of time. Even worse, what if the page had wrong content and the webmaster made changes to it?</p>
  
  <p>How can I force Facebook to flush its cache and update it with new content on the website? </p>