Digital Trends – When a user posts a link into a Facebook comment, the link auto-populates with a photo and description. Identical to sharing a link on a wall, the new commenting functionality allows Web users to preview content before clicking on a URL. The comment also loads video data in the Facebook video player for a preview. Itâs unclear how widespread the new commenting functionality is being implemented. As of this post, the new functionality isnât working on Facebook for the majority of users.