But yes, I think directed graphs would help me. Take the use case of modeling social relationships: each node is a person or company with a short bio, links can include "funded-by", "worked-with". Suddenly you have a tool that you can use to traverse professional relationships to find a connection to an investor funding a certain type of company. You can sort of do this with LinkedIn and Crunchbase, and it's possible with TheBrain although its UX is very tedious.