I watch pageview traffic to about 100 popular Wikipedia health articles. In January 2014 as compared to January 2013, stats.grok.se reports about a 50% drop in pageviews. 

Does someone have a ready explanation for this? The obvious explanation would be that Wikipedia's traffic has halved, which does not seem right to me, but it could be so.

Can someone direct me to previous or current conversations about this?

yours,

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