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I don't know if this could be combined to include a recommendation as well as 2 questions, but I noticed that quite a few questions on SO have duplicates.

  1. I would like to know whether these duplicates remain open forever, or are they eventually removed over time?

  2. Also, (the recommendation - kind of - part) are similar questions that are marked as duplicates used for machine learning to train the Lucene search to optimize better and decrease the volume of duplicate questions?

marked as duplicate by Robert Harvey Oct 16 '13 at 4:34

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migrated from stackoverflow.com Oct 16 '13 at 3:55

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