Open Graph 2.0 refers to the latest version of the Open Graph protocol, a set of standards and guidelines developed by Facebook to allow websites and applications to integrate with the social media platform. This updated version includes new features and improvements, such as the ability to customize and optimize how content is shared on Facebook, as well as enhanced support for mobile devices. With Open Graph 2.0, businesses and developers can create a more seamless and engaging experience for their audience on Facebook, increasing visibility and driving traffic to their online presence.