FB Share Link Button doesn't fetch and display desc and image

Hi,
Facebook crawls a page in order to decide how to display it.

You can use st_image property of span tag / og_image tag in order to specify the image to be shared when sharethis widget is used for sharing:

To know more about the customization , you can visit the page:
https://support.sharethis.com/customer/portal/articles/475079-share-properties-and-sharing-custom-information

WordPress has ways to put meta tags. Typically, this is done in the header.php template for the theme.

https://codex.www.ads-software.com/Meta_Tags_in_WordPress
There are also wordpress plugins that setup these tags automatically.
For eg: Yoast WordPress SEO

Thanks for using sharethis.
Regards,
SharethisSupport Team,