This thread is about cliques:
http://greekchat.com/gcforums/showth...hlight=cliques
It's not very lengthly, but to sum it up... have activities that "force" girls to hang out/work with each other. That sounds bad, but I hope you know what I'm getting at. Read this thread and you'll know.
And sometimes, if you have larger new member classes, there are going to be cliques no matter what, and there might be nothing you can do about it. Some people are closer than others.
And this thread is about different ways to educate new members, other than simply having them read from their manuals:
http://greekchat.com/gcforums/showth...isual+learners
Use the search function. It will be your best friend.