[Arcsech]

Given that it's effectively key->key->value, I'm guessing Cassandra for the main backend. The data model fits very well, and it would give you the kind of scalability you would need for this sort of thing.

[smarx007]

Given how ridiculously basic the website is, I think you're right. It should have been a real triplestore with a SPARQL endpoint though.

[bpicolo]

There are whole databases built around the concept: http://www.datomic.com/

[smarx007]

I browsed the website, but couldn't grasp what is the main value of that product or how could it be useful for the showcased website. Could you please educate me a bit?