Anders Wennersten, 29/09/2013 12:02:
The number of accesses to Wikipedia has jumped 25-40% since July [1]
You mean positive +25 % don't you? I don't see this figure anywhere, where are you looking? There is a +25 % in August compared to July in sv.wiki (but single-month peaks are not to be trusted that much).
and I suspect it is related to the new interface Google has created where an extract from Wikipedia resides on the right part of search page.
https://en.wikipedia.org/wiki/Knowledge_Graph Usually it's been anectodically blamed for reducing rather than increasing visits. There is no clear timeline of the changes they did so it's hard to make correlations in a serious way (nobody even tried so far, I think?).
Nemo