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Re:Ask HN: Building algorithm for Trending News/Topics of a ... by usgroup on Thursday February 23, 2017 @07:02AM (#13713219)
For major news sources:

Guess it by correlation. E.g. Google for something that appears on every BBC news page and observe the order google returns the results in to infer popularity. Do that for all the countries major news outlets.

Run all the sources through OpenCalais to collect features.

Present the features.

Re:Ask HN: Building algorithm for Trending News/Topics of a ... by fghafoor on Thursday February 23, 2017 @05:49PM (#13718614)
Interesting.