[33girl]

I don't quite understand the question...we have the 2 in SA & 2 in Chicago (and used to have 2 in Philly), but none of them are "twin" chapters. The alum chapter helps whichever collegiate chapter that might need it, or both, or neither. How much interaction the chapters have, I don't know...being in the same city doesn't necessarily mean you're next door to each other.

As russell said, the reason why you would want more than one chapter in a city is because there may be more than one quality institution in one city. Yes it's nice to spread out geographically, but I can't think of any group that would say "we can't go to Pitt because we already have a chapter at Carnegie Mellon." Both are places lots of GLOs would like to be.