LinkedIn and Neo4J
I was recently asked to get some data from LinkedIn and put it in a graph database Neo4J. (http://www.linkedin.com/ and http://www.neo4j.org/). I found an article talking about this subject and followed it (http://blog.neo4j.org/2013/08/exploring-linkedin-in-neo4j.html by Rik Van Bruggen )
Basically he takes you through registering your application with LinkedIn, using a simple python script to access the REST api, saving data in simple CYPHER format and viewing it in Neo4J.