Tells Facebook to refresh their cache for the current page.
Facebook Page Debugger adds a context menu item that allows you to send your current page to the Facebook debugger tool, which tells Facebook to clear it's page cache and reload meta tags, likes, and any other pertinent Open Graph data on the page.
Great for editors/developers who are continually updating content pages and need Facebook to see those changes immediately, as Facebook will cache a page for an indefinite amount of time.