Content categorisation service. For example news. There are thousands of topics. They are hierarchical. Every news article touches some of those topics to vari

Content categorisation service. For example news. There are thousands of topics. They are hierarchical. Every news article touches some of those topics to various degree. I would love to subscribe to some topics with some kind of tolerance. Like I want to know about most important world political news. I want to know about important IT news and my country political news. I want to know almost everything about Java, cryptography and my city news. I want to get every content from or about my favourite bloggers. And that should be extended to all kind of new content. News, articles, videos, tweets and so on.