When a URL get shared or liked on Facebook, Facebook will automatically request this URL to pull the title, description and images and temporary store those information on Facebook’s servers.
Meaning Facebook will use the cached information (website title, description, image URL) if you or someone else try to share this URL again. We have to wait until Facebook to clear its cache and get your updated information but not sure how long.
Unlike browser cached asset files such as css, js or image files, we can clear browser cache to load the updated; we need to ask Facebook to clear cache on their servers.
Facebook provides a online debugger tool for us be ale to clear cache and reload a particular URL, it’s https://developers.facebook.com/tools/debug
Simply enter the URL you want to clear cache then click Debug button, ex: http://4rapiddev.com
In case the URL has been scraped and still load cached information, let try to click on button Fetch new scrape information to ensure Facebook completely clear the URL cached.
This online debugger tool is really useful for me when I test adding meta tags for social sharing on my site. Don’t have to wait all the time or login with another Facebook account any more