Hello friend,
Whenever we share a any URL on our Facebook, Web crawlers will surely visit this website to get some specific information about the linked page (the page link which we have shared on FB wall), for example title, text and image.
This is because the Facebook crawler mechanism uses a cache so that if the same user or any other user shares the same link on a Facebook wall then the same cached version of the data will be used rather then crawling again the website.
To clear this caches you have to visit the below link first it's Facebook Debugger-
https://developers.facebook.com/tools/debug
Now Enter a URL of the page you want to share. It will automatically extract all the information on your meta tags and also clear the cache.
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