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I've noticed similar themed posts appearing in clusters constantly on HN. It's way too commonplace to be coincidental.

• constantcrying 3y ago
  No it is coincidental. Look at the algorithm yourself.
  • Solvency 3y ago
    It doesn't mean it's the algorithm, it means users could be tactically posting to ride a wave of similar interest. That's all.
    • constantcrying 3y ago
      Yes, you are right. Potentially the effect is partly due to that after seeing the first post a user stumbles over something related and decides to post that as well.