Consensus —Handling down votes.

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I've seen Down voting issue in many forums. They don't handle it transparently.

Things observed and reported by others too --

• You get downvoted for no reason, may be personal reasons and competitors always downvote each others posts.
• I've seen this happen in many online forums, HN and Reddit.

And there is no way to handle this?

How should we tackle this kind of behavior? As this is increasingly happening in forums.