What does that mean?
Ìf you change the open graph description or website content afterwards (when it has been published earlier) You have to “…fetch new scrape Information” on Facebook.
Otherwise Facebook will share the old open graph description when someone is sharing the post.
Why is Facebook sharing old open graph information?
Facebook caches your website’s content and all open graph information for a unknown time.
Thats the reason why we have to tell Facebook when our website content has been changed.
Facebook is than purging its internally cache and fetch the new website information.