The integrity of content on Facebook is a serious concern, and domain verification is a step towards ensuring that only verified owners can edit the way their content appears on Facebook. Many publishing apps use link editing to customize and create engaging content for the Facebook community. In an effort to preserve this essential functionality in a way that protects the integrity of publishers’ content, verified link owners will now have the ability to overwrite link metadata when creating link page posts.
This document provides information about:
Domain Verification provides a way for you to claim ownership of your domain in Business Manager. This ownership allows you to control editing privileges of your links and other content to prevent misuse of your domain and to keep bad actors from spreading misinformation.
Domain Verification is the best way to handle ownership if:
To implement domain verification, you need to choose between two different methods: 1) add a DNS TXT entry to your DNS record to confirm that you own the domain, or 2) upload an HTML file provided by Facebook to your web directory and confirm domain ownership in Business Manager.
You can still add Open Graph tags to your website to indicate ownership—this does not require the use of Business Manager. You can find more information about implementing the
fb:pages tag in the Open Graph – Object Properties documentation.
More about Domain Vertification on this link https://developers.facebook.com/docs/sharing/domain-verification