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by bnegreve 3222 days ago
I remember a talk by Thorsten Joachims at ECML/PKDD 2013 where he was talking about this, you can watch it here.

https://www.youtube.com/watch?v=fX9lj0UdB9s

Around 11:40 he shows evidence of this "dishonest" behavior. As far as I remember, the whole talk was very good. He has some publications on the topic.