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encyclo - 7:38 pm on Jul 27, 2009 (gmt 0)
Whois data, toolbar data, AdSense and Analytics data, data from ISPs, click-thru patterns... there are a multitide of data points that Google can use to identify networks. Just relying on links from different C-class IP addresses when the other factors haven't been addressed is rarely in itself sufficient to pass under the radar.