The title basically says it all.
How can an ENFP like me differentiate one of you guys from the rest? Do you guys typically have a thing you guys do, or something? I've only ever met one INTJ in my life so far (that I know of), and they seem pretty cool.
I guess my question is, in social settings, where can I find you guys? Who do you typically hang out with (personality type wise)? What do you usually talk about? What topics of conversation do you avoid? Are you quiet, or is that just a stereotype?
Any and all thoughts appreciated!
It sounds like you're asking two different questions. I'll try to answer both if I can.
The title suggests you want to
identify INTJ's when you see them. This can be tricky, because on the surface all introverts with Thinking preferences can look quite similar.
Our demeanor can be a lot like that of an
ISTJ: quiet, serious, maybe a little severe, with strong opinions and fairly intentional life choices. Our fashion choices may also be quite close, though INTJ's may be a little less likely to be seen in athletic wear. The best way to tell is to listen closely to the way the person speaks. ISTJ's tend to go for the more obvious ideas and solutions, whereas INTJ's scale back more in their thoughts, and will look at newer, weirder ideas.
ISTP's can in some cases be mistaken for INTJ's, as well. They're not shallow people at all, and they can be very strong-willed and dismissive of anything they think is dumb or useless. They also can be fairly open to weirder ideas. The distinction is that they won't come up with them on their own. Where an ISTP is all about practical application, an INTJ is interested in all stages of idea development: initial concepts, debugging, restating, applying, experimenting, etc. INTJ's are more interested in innovation.
INTP's are almost identical to INTJ's on the surface, especially when compared to other types. These two can fairly often be seen together, talking science, philosophy, gaming, music, etc. They're both weird types who are interested in originality, examination of tradition, and anything too obscure or weird to talk about with normal people. There are lots of deeper differences, but one is that INTJ's are wayyyy more practical. INTP's are not at all results-oriented, but rather process-oriented. INTJ's are more likely to take action, to speak up, and to take leadership than INTP's.
There are more tells, but I'll spare you for now.
Now, if you want to
go out and find INTJ's...
This may be even more difficult, because honestly, INTJ's don't often want to be found. We don't seek out new relationships. We don't put ourselves in places where people will feel a license to approach us. Generally.
There are interesting exceptions. The most natural form of social interaction for an INTJ is
intellectual discussion. If you happen to take a class with an INTJ, and he cares enough for the subject to raise questions and talk with colleagues, you'll likely know who you're dealing with. Follow up afterwards, asking for more thoughts (because there certainly are more).
Work is a tricky one. INTJ's tend to take boundaries pretty seriously, so you may get resistance if you try to initiate a friendship with an INTJ coworker. Maybe still worth a try.
INTJ's are sometimes attracted to art, music, and small business - things that get their thoughts and creativity going. If you come across one through those areas, it can form a basis for friendship, because it's something the INTJ is passionate about. Showing appreciation for what they do is a natural way to earn the trust and favor of an otherwise-aloof INTJ.
That's all I got.