Well I'm normally considered an INTJ, but I've never used an INTJ tag. I've checked, and my threads don't generally have tags, and those that do are as follows:
- Ethics, morality, personality, values
- civics, conservatism, politics
- nonsense, quotes, share
- 40k
- MBTI
- INFJ
If you
actually click on the tag, you'll find that the threads are mostly made by non-INTJs asking
about INTJs. That is, it seems to be mostly people attempting to understand the type, and in this regard I'd agree with
@Ginny's first point, in that INFJs and INTJs are 'type siblings' thanks to that shared Ni/Se axis, and so the similarities are such that the differences are sometimes thrown into sharp relief, so there's an enduring fascination for some. In fact, INFJ/INTJ relationships seem to be a common pairing.