The image displayed with your site is typically the image selected as your ‘Cover Image’ of your page link. It may be helpful to view our Cover Image guide for more details
This article will show you how to update the image displayed when sharing your site on Facebook.
Steps to change your Facebook page link image
Check what it currently appears as in Facebook
Navigate to your Page editor for the link you trying to show on Facebook
Navigate to Settings on the page you are linking
Press on Edit Cover Image
Choose new image from Import from Format Page or from Upload Images
Check to see if image has updated in Facebook
If not, go to Facebook Object Debugger https://developers.facebook.com/tools/debug/
Type in URL of page you are linking
Press on show existing information
If image needs updating press on 'Fetch new information' you may have to do this more than once
Re-enter in reloaded Facebook page to test that new image is appearing
This is similar for LinkedIn, you can reset the image there using this link https://www.linkedin.com/post-inspector/inspect/
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