I was playing with Google Insights for Search recently (which I like a lot better than Google Trends, by the way) when I came across this very interesting graph.
What you are looking at (and if you click through on the graph you will see this live on Google Insights) is the Google search history for [...]
google insights
Searching for Weight Loss
October 11th, 2008 — , Observations, google insights, search history, weight loss blog, weight loss chart, weight loss graph from john - from fat to fit @ John Is Fit - Personal Weight Loss Blog
