I want to integrate into a new social circle (I'm in college) and my friend is willing to introduce me to the members that I don't know. I know some of the members but not all of them, and some of them I know more than others. Since I know some of them, either on an acquaintance or friend level, should my friend introduce me to them or should I just hang out around them without an introduction? If my friend should introduce me, how should he do it?