That's the thing, I don't think there needs to be a tech angle, but it does need to be interesting. For example, I posted a non-tech article about the world's most liberal prison, a prison island in Norway with a supermarket and cafeteria (http://news.ycombinator.com/item?id=2209884) because I thought it was an interesting and unique read others are unlikely to find.

Of course, upvotes will tell as to whether this is a valid story.