This is one of the best, most magical things on the Internet. SPARQL over wikidata is the closest you can feel to actual omniscience and I never truly understood the value of linked data until I played with it. Everyone should tinker with it!
I tried "who was harry potter's aunt?" on it but that didn't seem to work. I tried googling the same question and Google gave me the correct answer. I think that Google, despite result skew, is pretty powerful sometimes.
I asked Alexa the same question and she returned the correct answer as well.
Google can be disappointing, however, when you want to ask a question few people have thought of. It would be hard to get a clear answer to "which family had the most members in Harry Potter?" etc, whereas that's a query you can write pretty naturally with a graph database, RDF or otherwise.
I'd never say that I wish we just had massive triple stores and Google had never been invented, but I still maintain that linked data is exciting and expressive.
Indeed, I have also been having fun playing around with this. I had no idea that such a service existed until I read this posting - this is what makes HN such a magical resource.
