A graph, a topic map which ties together related posts, detects duplicates automatically. Each URL is a topic, but is typically about one or more other topics.

A graph, a topic map which ties together related posts, detects duplicates automatically. Each URL is a topic, but is typically about one or more other topics. Simple NLP can detect those topics (NERs) and link them to URLs. Disambiguation will be problematic until neural nets are trained to reduce that.