I just had the opportunity to read your book and firstly I would like to congratulate you on it's success as well as thank you bringing such a valuable piece of work to us. I don't usually comment around like this but reading your book has brought into my mind a few things which I cannot help but express and share (plus I am feeling too lazy to get my work done

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I have found the first few chapters very absorbing and analyzing myself on the basis of your questionnaires (by taking into account how I used to act and feel since my childhood days up to today, at least as much as I can remember), according to your methods I fall roughly into the middle of the continuum with a slight (well may be more) deviation towards the introverted end. Naturally I thought I had an advantage. But after reading the rest of your book, I am realizing more that you can't trust anyone. People who look introverted may just be shy extroverts or those who look extroverted may just be pretending introverts, hence I won't be able to follow any particular way of dealing with any person. What is more confusing for me is that, how do I know whether what I had analysed to be an introvert nature after viewing your questionnaire, has actually been just fear, shyness and anxiety (may be even "antisocialness") all my life. It is bringing me to a sinking realization that I am neither intro nor extro-verted, but clearly have a problem. It doesn't quite bother me right now but I want to be prepared for any kinds of problems it may bring later in life, as I have always felt I cannot take much pressure.
The bottom line is this world is very confusing, and it is doing it's best to confuse me even more. Information may be a source of power, but a lot of it is a very good source of confusion in this internet world.