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Don't just join, become active in a few groups. I've had people at my PGY2 interviews ask me about my experiences in my student groups, and I'm sure they would have been able to tell if I was lying. Students who list 6 organizations with no leadership positions scare me- what were you doing? Did you actually do anything for the projects in the groups or just go for lunches?
Agree with this. Interviewers can see through people who list a dozen clubs but no leadership activities or anything meaningful. Anyone can sign their name on a piece of paper. My residency interviewers asked me VERY specific questions about my activities, leadership and community service. It would have been impossible to BS my way through those.