Does Graph automatically map to other graphs, i.e. Facebook Open Graph
You can easily import data from other graphs on other websites & apps such as Facebook's friend graph or its Open Graph, Twitter's friends & followers, LinkedIn's connections etc.
Each of our social plugins has a "friend" graph built-in. When a user authenticated with a social network, we import and maintain the user's friends (and followers if appropriate) until the credentials are no longer valid in accordance with each network terms & conditions. That gives you a really killer way of interacting with your users and providing much more value than using just social authentication.
Graph also offers 2 plugins to store and manage graph data the Graph plugin and the Advanced Graph plugin.
The Graph plugin is designed to store and manage simple connections between people, places and things. For instance, "Jason is friends with Tanja, Mary & Tom." You can then ask it questions like "Give me a list of Jason's friends;" or "Is Jason friends with Tom?" or "Give me the friends Jason, Tanja, Mary and Tom have in common;" or even "Give the the friends that Tanja, Mary and Tom have in common, but who are not friends with Jason."
Advanced Graph plugin
The Advanced Graph plugin take the connections concept from the Graph plugin and adds the concept of interactions and occurances on top of that. Now you can store events like "Jason emailed Tom about 'network settings' on June 12, 2014 at 10:35am."