Changing the Thumbnail When Sharing a Link on Facebook

 Changing the Thumbnail When Sharing a Link on Facebook

When you share a link on Facebook -- such as a YouTube video, webpage or image -- a thumbnail is automatically generated to help illustrate the link when it's displayed on your wall. The thumbnail is generated automatically as the Facebook system scans the link for any associated image files. Most links have several image files associated with them, in one way or another, and Facebook won't always select the best one by default. You can change the thumbnail for your post to use one of the other images at the link location.

Paste the below code in  head

<meta property="og:image" content="https://gocakes.lk/images/fish.jpg" />