This plugin inserts the fb:app_id meta property to fix the Facebook Sharing Debugger error «The following required properties are missing: fb:app_id»
This plugin is usefull to website owners who share links from their website on Facebook. If you debug your website URL with the Facebook Sharing Debugger you might see a warning with the following message.
Missing Properties: The following required properties are missing: fb:app_id
This plugin inserts the required meta property with the given app_id. You have to create a facebook app to get the app_id!
To create a facebook app, visit Facebook Developers
That is the App ID you need to copy.
On your WordPress Admin: