Some Strange Things About Search

This is not an investment idea per se but does bear on the topic.  I've gotten curious about how one would check how often a particular search term is used by folks using Google and Yahoo.  It seems that the quick way of finding this out is to use Google Trends and Yahoo Buzz. Both of these services also list the "top" searches for a given day.  There is something puzzling about the results, however:  there is almost no overlap between the most popular searches reported by Google and Yahoo.  Now, I understand that the companies may calculate search numbers differently but no overlap whatsoever seems to me very odd.  I'm going to look into this further and set up a separate blog to track and explain this.