Real lfe examples to start learning


I’d like to start learning some graph DB. I was thinking about neo4j yet orientDB seems to be as well interesting. The problem is that it has no real life examples (I cannot find any). Like “fraud detection”, “product recomendation”, “marketing campaigns” or else. Anybody knows some good tutorials (not academic “select from”… or “display five graph balls”) that demonstratrs power of the product?