Google trends are noisy, but there is still a pretty strong signal in there (http://googleresearch.blogspot.com/2009/04/predicting-present-with-google-trends.ht

Google trends are noisy, but there is still a pretty strong signal in there (http://googleresearch.blogspot.com/2009/04/predicting-present-with-google-trends.html http://googleresearch.blogspot.com/2009/04/predicting-presen...). And almost surely that signal is gathered from a far larger audience than the MBTI sites. That said, it would be interesting to correlate their numbers with the google trends.