Both Facebook and Google are talking in terms of graphs going forward. Graphs communicate best to users about the objects rather than the keywords involved in the content……so how are they both pitching their solutions.
Personalisation, finding the dentist that your friend uses, and helping you to find people you should know is what Facebook is trying to make easier. Facebook is about curating all of your information, making it sound as if you weren’t entitled to this information before social graph. They will launch and then iterate and develop as a major column of Facebook’s competitive advantage.
Google knowledge graph wants to make items easier to see the ideas behing your search. Moving from a search engine to a knowledge engine is a conceptual shift that is already happening. Google wants to grow a knowledge graph and understand and intelligently connect people and knowledge more fluidly.