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Topic:

"What is the impact of online news coverage of presidential elections?"

Key concepts :

online news AND presidential elections

Explanation:

  1. "What" is unnecessary. Question words don't express concepts & should not be used.
  2. The terms "impact" and "coverage" are words that really do not describe a unique topic concept (coverage of what? impact of what?) and therefore are usually unnecessary. They instead point to the major concepts: impact of online news and coverage of presidential elections.
  3. There are therefore just 2 major concepts: online news AND presidential elections.