Originally Posted by waves

Oh my, I thought you made up 'ambivert' for fun!

From the PsychCentral article:

The counselor who evaluated my Myers-Briggs score, said she felt that I was probably right in the middle of the E/I scale, even though I scored very slightly to the extravert side. She said that's probably why I had a hard time with the questions that tested that.

I personally found the Myers-Brigss to be one of the most useful things of its kind I've ever done. I have found its "types" useful in understanding myself and others, and in communicating.

Types or artificial categories are good instruments for thinking things out. They needn't and must not be treated dogmatically. These tools are not part of reality. They are only imagined boxes, and we cannot expect to put the real world into them. Instead, it's useful to appreciate similarities between reality and imagined boxes.