Some of the newer members I have talked to think that you can only join one chapter and so they take a lot of time looking for the one they want. I think bungie should post something when you sign up saying you can join up to 15 seperate chapters of the 7th Column so that no one is ever confused about this. I have talked to at least 5 people this week who didn't know they could join 15.
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I think in general there should be almost like an add on b.net main page to tell people to check out the 7th column to get some of these "new people" involved in the bungie community.