Do you enjoy talking to strangers? If you, I got new for you. Extraversion tends to mainfest itself in outgoing talkative and energetic behavior
I do enjoy. I see myself as an extrovert person who always wants to be in the company of people 
A great way to know for sure is to take the Myers-Briggs Type Indicator test. Its was constructed by Katharine Cook Briggs and her daughter Isabel.
Haven't heard about it before. Is it available online? I have taken other tests, but not this one
Yes, it is a free online test. The MBTI was specifically designed to emphasize the value of naturally occuring differences. 
What is the main difference that makes this test stand out among other personality tests?
The test has personality types that classify behavior Introvert, Extrovert  and qualitative and quantitative differences.
Do you think i should take this test? I have already taken similar tests and all have confirmed my extroversion
Absolutly, I may have gotten these types wrong earlier. There is actually 16 types that classify your interests, needs values and motivations.
Yes indeed. But all those types fall within only two broad categories, either you are outgoing or not
Correct, nearly all models of personality include these concepts in various forms. I highly recommend to google it for more details.