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That presumes that the negative comments are always the ones derailing the discussion. For example:

"I think these questions at IAC are great, it's good that people get a chance to <self promote thing> at a technical conference"

"Wtf is with these stupid questions at IAC? They should be asking about <fascinating technical detail>"

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Hah, you just described the sheer drivel which is comments on LinkedIn stories. Good point - contentious and _well presented_ negative arguments are still helpful.

Then perhaps use sentiment analysis to remove the derailing part of both negative and negative comments?

i.e.,

"I think these questions at IAC are great,..."

"...they should be asking about <fascinating technical detail>"

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