Google Caffeine index is now live on one Google data center. Matt Cutts confirmed that the “IP 209.85.225.103 hits the Caffeine data center about 50% of the time, more often than other IP addresses, but it's always been the plan that Caffeine would roll out at one data center (no more data centers will get Caffeine until at least January).” Matt explained that the update webmasters were noticing were either because “Google just got better at determining how much weight should be given to links to a site.