Facebook's Sharing Debugger tool helps you preview how your content might look when shared on Facebook. It also shows errors or warnings when you have problems in your code which might impact how your content performs.
If you are facebook user login your id and go to "https://developers.facebook.com" link for registration as a facebook developer. Facebook will provide your FB APP_ID for further uses. Show activity on this post.
Including the fb:app_id tag in your HTML HEAD will allow the Facebook scraper to associate the Open Graph entity for that URL with an application. This will allow any admins of that app to view Insights about that URL and any social plugins connected with it.
You need to add this into your head tag in HTML source
<meta property="fb:app_id" content="XXXXXXXXXXXXXXX" />
That is default app id.
Replace XXX
With your app id
If you don't have an app to associate the website to, then that warning can be ignored.
For an example of a successful website which doesn't have a fb:app_id included, you can run a debug on this stackoverflow page's URL within the Facebook Object debugger, you will see that it also produces the same warning message.
The posts themselves will generally appear the same as they are represented at the bottom of the debugger tool.
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