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What is Google doing with the site:-query?

Ever since this weekend, Google is baffling users with the data they return from the site:domain.tld-query service: for nearly all larger sites, they are on a noticeably lower level than they were a week ago. Wikipedia.org lost 72%, Ebay.de about 90% and according to the data, Amazon lost a whopping 94% of its pages in the index. Here we have the average number of pages from the top-1000-domains that are in the Googleindex, based on the SISTRIX VisibilityIndex of the past 12 month:


You can easily spot how the average amount of pages has increased significantly over the past year and how it was nearly halved this week, from 16,1 million to 8,6 million pages. We can only speculate on the reasons for this change. Those of you who are open to conspiracy theories, could be helped with something like, “Caffeine, first and second index” … We shall see how this will turn out. Update: Eric has also written up some thoughts on this subject: Dramatisch fallende Seitenzahlen im Google-Index (dramatic decrease in the amount of pages in the Google-index)