The Open Graph protocol. Technical Guides: Open Graph. Mark Watson's blog: Using Open Graph. The Open Graph Protocol is a reasonable new for adding semantic content to web sites. Open Graph got a large boost when Facebook starting using it to encourage easy linking of preferences, etc. to better model users to increase advertising revenues ( documentation ).
Freebase also has an Open Graph interface. For example, you can look me up on Freebase using (leave off the "? Html=1" to get a JSON response): Facebook allows ‘flexible sentences’ for Open Graph activity. Facebook allows ‘flexible sentences’ for Open Graph activity Facebook today announced new “flexible sentences” options for apps that publish to Facebook using custom Open Graph verbs.
Developers can now better control the sentence structure for stories that users share from their apps.