Ars Technica summarizes a report on search engine usage online, which finds that Google users are more loyal—they are less likely to use competitive search engines.
I think the more interesting number is the number of searches per month of the various users. Or, more specifically, the combination of these two numbers. Google searchers perform, on average, about twice as many searches as the users of their competitors. I find it hard to believe there isn’t a correlation between this, and their loyalty. The only question in my mind is the nature of the connection. Is it purely correlation (those who are more likely to use Google are also more likely to do many searches, for some 3rd reason)? Or is there a causal link?