This would make sense if it's a social experiment to see if anyone will return the complement.
Personally if complemented I return a complement, but then, I am possibly an intp. But usually the intp's online are also oblivious to such things, so, meh, who knows. The function descriptions are vague enough to retrospectively explain any behaviour, therein lies the genius.
So yes, erm...go back to your "belly rubbing" (what the fuck did I just type that?)
This is not why I did it. And you INTJs needn't be so suspicious.
I was just expressing my gratitude for those of you INTJs who are yourselves, resulting in being awesome.