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On the StackExchange sites I answer quite a few questions, but I find that once the answer (or even a few answers) is there then the user just leaves the question never to see it again. They also do this before even accepting or upvoting an answer.
Could something be done to remind users to accept an answer which will then close the question? Then it won't appear as unanswered and the answerer will receive his/her reputation points.