The Open Graph ProtocolThe official Open Graph logo.Protocol OverviewOriginal AuthorFacebook (Meta Platforms)Initial Release2010TypeMetadata standardFormatHTML `` tagsXML Namespacehttp://ogp.meRequired Core Tags og:title — Title of the object og:type — Type of object (e.g., video) og:image — Preview image URL og:url — Canonical URL IDOfficial LinksWebsiteogp.me The Open Graph Protocol is a specialized web page protocol used between client devices (computers, mobile phones, tablets, etc.). The protocol was initially designed for Facebook to enable developers to integrate their pages into Facebook's global mapping/tracking tool Social Graph. These pages gain the functionality of other graph objects including profile links and stream updates for connected users.
In recent years the protocol gained wide spread use and also was integrated into functionality in major messaging apps. The protocol utilized in messaging apps such as iMessage adds the functionality whereby if a user shares a URL, the corresponding Open Graph metadata of the URL will allow for the display of the thumbnail or assigned image as part of the link.
History The protocol was initially published in 2010 as part of Facebook. Starting in 2016 it became integrated with iMessage in a functionality Apple initially called Rich Link. Later on it was also integrated with Whatsapp messaging.
References
External Open Graph & Social Link Card Validator