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Yahoo went secure recently which means the referrer data will be skewed. Read more: http://searchengineland.com/yahoo-search-goes-secure-182343

thanks for this report

Hmm. Let me research, but that seems like a legitimate reasoning. The only crux of that answer is that why would a typical searcher (someone like my parents) give a poo about what Google has selected as relevant? Especially when in some cases it's as innocuous as ALT text behind an image? If it wanted to utilize that feature to show the searcher where on the page was the most relevant to what they searched for, so that maybe they would know where to look when they arrived on the page, it's doing a very poor job. I think we're viewing a feature that doesn't have the quirks worked out yet because there doesn't seem to be rhyme or reason.