Here’s a quick tutorail to know how you can customize your page and posts titles, description and image to show when your page and posts links are shared in facebook and twitter:

One more thing that’s very important is that you need may need to clear facebook cache of your url incase your recent changes has not appeared.

Here’s the url where you can debug your facebook share:
https://developers.facebook.com/tools/debug/sharing/

Here’s a quick video tutorail:

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