The "related questions" list displayed next to our questions leads to irrelevant hits in search engines. It is necessary to hide the "related" column from external search engines to get rid of those irrelevant links.
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closed as not constructive by Martijn Pieters, BinaryMisfit, Bo Persson, Andrew Barber, kiamlaluno Oct 31 '12 at 16:48
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Who says it is necessary?
First, who says search results of external search engines needs improvement? Are you aware of the frequent situation where someone searches Google to find information to answer a new question, and finds that question itself as one of the highest-rated results?
Second, what's to say that those related posts don't actually help, by providing more context? (They are, after all, "Related"... not "nonrelevant"(sic)
In short; I think your premise is incorrect from the start.
From the site's POV, any hit from google that brings traffic is welcomed, so..
If you are talking about the hit-miss ratio of "related content" as a function of in-site navigation, then that would be a separate matter.