MBTI?

for somereason.. i've been really into Mbti's ; i was into them before. but since i'll be studying them soon for school. i'm really interested now.
so. My question is.. 
i'm a INFJ!, and i'm really curious to find out if my personality is compatible to my friends! 
also. wtf is a mbti? (if you don't know what it is) like i said before. it's like a personality test! i suggest taking the test

here.->www.16personalities.com/ or
here-> www.humanmetrics.com/cgi-win/j…,

if your more. simplistic/lazyasfuck, or just don't like tests. go try figure out your mbti simply by reading and looking here! upload.wikimedia.org/wikipedia…