Guidelines of interaction state that members shall discuss topics in their current context, though opinions may be formed regarding the topic starter based upon past postings.
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Moderation has had guidance in this area published for a few years in our Infidelity areas, since those areas seem to be the most common location of members ignoring this guideline. Link to thread:
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For clarity, if wishing to offer opinion about or ask questions related to relevant content of past threads or posts from a thread starter, this is the policy.
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