Interesting country breakdown!
Tilman Bayer, 14/12/2015 12:32:
For the top three, I looked at how pageviews developed on a daily basis during the last three month including the week after this large change (until Dec 6):
In Greece, the +21.6% rise was the result of an isolated spike from November 23-25. This can be traced to a single page on the Greek Wiktionary which on most days before and after only saw a single-digit number of pageviews, but on these three days received more than 2.8 million: τάλε κουάλε https://el.wiktionary.org/wiki/%CF%84%CE%AC%CE%BB%CE%B5_%CE%BA%CE%BF%CF%85%CE%AC%CE%BB%CE%B5. It’s about an expression that apparently comes from Latin via Italian (“tale quale”) https://en.wiktionary.org/wiki/tale_e_qualeand means something like “exactly the same” or “spitting image”. From the form of the spike, it was likely not the result of actual human interest, rather an undetected bot trying to learn exactly the same about exactly the same.
In Ireland, the -20.6% drop marked the end of a plateau whose start had actually shown up in the report for the week until November 1 https://lists.wikimedia.org/pipermail/mobile-l/2015-November/009919.htmlalready, where the country was the top changer with a 40.2% rise.
For South Africa, the -20.6% drop does not form part of a clear pattern.