I've been observing the people I know IRL when it comes to sociability, and I have noticed a general pattern. Independent of type (SEE, LII, etc.), one's subtype tends to have the greatest effect on how gregarious the person is. In these people I've observed, those who have extroverted subtypes act more outgoing, and the opposite for introverted subtypes. Whether it's a creative or base subtype doesn't seem to have much of an effect, though.
My brother is LII, Ne subtype. He is always hanging out with his group of friends, and I have to fight him for the car constantly because of this.
My mom is ESI, Se subtype, and she always tells me that I don't hang out with people often enough. She also talks a whole lot more than I do.
My dad is SLE, Ti subtype. My mom told me that he's an "introvert" in the traditional MBTI sense, which wouldn't work out well in Socionics.
I'm SLE, Ti subtype too. My mom also told me that I'm an introvert, just like how she did with my dad. When I go out, I generally prefer to do things by myself because I like to think about stuff while I'm doing things.
Pretty much all my friends whom I've typed with confidence also fall into this general pattern. Granted, I'm not saying that it's a be-all and end-all typing method, but I definately find it interesting and useful.
I've noticed that the orientation of your base function doesn't seem to matter as much, despite commonly-held belief that it does. I'm wondering if other people here have noticed such a thing IRL, or not. Thanks for any input.