The crossorigin attribute is not being applied to the link element output. Some mechanism should be added to allow end-users to specify the appropriate values for this attribute if they are using link elements.
https://developer.mozilla.org/en-US/docs/Web/HTML/CORS_settings_attributes
https://html.spec.whatwg.org/#cors-settings-attributes
Closed: won't fix
2.0
Code
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
There isn't any current interest in working on the Drupal 7 branch. Since D7 is end of life in a few months, I am going to close this as won't fix. Please feel free to open it back up if you would like to work on it.