We share links all the time. On various social media platforms. The preview images may not always be in our control. But whe we share links from our own website/blog, you may want to choose a different image from the default as your preview image.
All it takes is one line of code in the head tag of your page.
<meta property="og:image" content="image_url_here" />
This should do the trick.
Have any issues implementing? shoot me an email at mail@chikezie.com.ng