INFJ's are sometimes confused for extraverts too.
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INFJs are deeply concerned about their relations with individuals as well as the state of humanity at large. They are, in fact, sometimes mistaken for extroverts because they appear so outgoing and are so genuinely interested in people -- a product of the Feeling function they most readily show to the world.
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INFJ Profile
It says here that it is a product of the Feeling function, but I think more specifically it has to do with how Ni interacts with Fe (or in the case of INTJ's how Ni interacts with Te). When an INTJ has a goal in mind I believe that it can really energize them to the point that it makes them appear to be extraverts. INFJ's are a bit different in that I think their "extraversion" shows whenever they are in a social situation where they feel comfortable. There may be some crossover between the two types as well since they are so similar.