How do you guys spot introverts or extraverts? Are there any specific body movements/posture/behavior that you look for (besides just the obvious)?
I feel like its sometimes very difficult to spot extroverts and introverts. I feel like if someone has an Fe function (wherever that may be, even if its the fourth function etc) it is far more difficult to tell whether they are introverted or not. For example, I'm an INTP and have a very strong Fe; I'm very expressive and generally very open with my emotions unless they're about people, which I keep very much on a short leash. I also keep my negative emotions in-check as well, but thats beside the point.
What I'm saying is that Fe is probably the most extroverted function, and the more developed this is in ANY type, the more difficult it is to tell if someone is an introvert or not. The function, at least for me, acts as a self-editing/self-promoting social booster. However, instead of making me a people-person, it makes me "good at people" because my more prominent functions are Ti and Ne. It craves attention and social insight, even when I dont want to be around people (hence why I'm on this site haha)
The easiest way for me to tell if someone is an introvert is not when I'm conversing with them, but when theres a large group. You can spot introverts because they'll become more easily distracted by their own thoughts; tending to be the ones who "zone out" or "go dormant" for periods of time. They can be very active in one conversation, but be very passive and even non-existent in the next depending on their topics of interest while extroverts will be more prone to joining in on anything. Also, introverts are most likely to leave from an event first. Trust me on this. haha
Another indicator is the willingness to take part in small-talk. I HATE small talk but my Fe dictates that I must in order to make certain people happy. I'm more the person who waves a quick "hello" to someone in passing, and I've noticed most introverts will do this to even their close friends instead of wasting time on such (to us) meaningless conversation. I dont like saying things unless I think they're worth saying while others would love to just talk and talk and TALK haha.
Another thing that makes it difficult to spot introverts is when they're loud around their friends. I, as well as a couple of my other friends, am an introvert, but can be incredibly loud and hyperactive when I'm surrounded by mis amigos. I have WAY more energy in a small social setting than I do in a larger one and I am intimidated by big groups. The smaller the group, the louder and sillier I'll be, and if people didn't know me outside of a small-group setting, they'd probably think I was an extrovert.
I dunno if I'm helping by my examples, but I think what I'm really trying to say is that you cant really tell if most people are an introvert or extrovert until you analyze their behavior in multiple scenarios.
I know, I know... tl;dr... just read the last sentence I guess haha