It's also very interesting to me how so much of this stuff about body language is now shrouded in, well, if not "shame", then at least embarrassment. All because the pick-up artist community has relentlessly focused on body language as some magical panacea to anyone's romantic woes.
This is one of the few blog posts I've read that talks about body language from a purely social perspective.
I wish there was more content like this on social norms, extroversion, and social signalling that didn't go at all into strange PUA themes.