Google have released a tool that lets us investigate and compare correlations of search volumes across different terms over time. What Does It Do? The simplest explanation is that it lets you see which search terms are always popular at the same time as one another. Google Correlate is a new tool takes Google Trends and throws it in reverse. With Correlate, researchers instead start with a trend and correlate that data to search terms.
More info at http://correlate.googlelabs.com/
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