There is a reason why I would never use such service like Prismatic. The main problem for me here is that it creates a confined universe for you where you are surrounded by only "relevant" information. For example I don't care much about fashion, but once in a while reading NY Times I stumble upon a very interesting articles about new trends in fashion or its history. It makes me think out of the box and expands my knowledge. There is no way a service like Prismatic would provide me with such articles based on my interests.