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From Matt Cutts:
In March, some people on WebmasterWorld started complaining that they saw none of their pages indexed in Bigdaddy data centers, and were more likely to see supplemental results.
- On March 13th, GoogleGuy gave a way for WMW folks to give example sites.
- After looking at the example sites, I could tell the issue in a few minutes. The sites that fit “no pages in Bigdaddy” criteria were sites where our algorithms had very low trust in the inlinks or the outlinks of that site. Examples that might cause that include excessive reciprocal links, linking to spammy neighborhoods on the web, or link buying/selling. The Bigdaddy update is independent of our supplemental results, so when Bigdaddy didn’t select pages from a site, that would expose more supplemental results for a site.
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