Are they still using the MB for recruitment? Do they do a tarot reading as well?
It can be a fun thing for team building or testing yourself on the internet, but whether its results actually mean anything is pretty questionable. Lots of people come up with different answers each time they take the test, depending on their mood at the time.
The Myers-Briggs Personality Test
MYERS-BRIGGS FOR DUMMIES (language warning for this one).
There are plenty of books/articles around about being a better people person if you're worried about being the shy, retiring type in an interview.
I think mgrath50 is pretty much on the money in this regard. Good luck, anyway!