tedster - 11:36 pm on Apr 17, 2011 (gmt 0)
I wonder if any of the data companies have looked at a diversity stat. Right now we can only use our subjective sense of things. But companies like Search Metrics, Sistrix and SpyFu keep very large data sets of week-to-week SERPs for the money terms. They could mine that data and see if there really is a loss of diversity.
Has anyone seen a study like that?