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I would think that a healthy community would not have any down/up/like voting system in place at all. A voting model encourages people to judge without comment. If you are posting in a format that uses a voting system, you may be a needy person who wants validation of others, not a discussion on the topic. If any system were to be implemented, I would recommend something like a trending, most shared or most discussed tag to ascertain the posts viability/popularity.