Whats your schools policy regarding behavior off campus?
Some schools here in Florida have rules for off campus / after school conduct and kids have been removed from activities for thisng like posting messages on facebook
One thing I was thinking is that due to your obligation to report maybe its a good idea for you Not to have facebook connections with the girls on your team~~~monitoring facebook status updates could be a never ending job, and what if you dont see a comment by one of your cheerleaders.
How will you prove "didnt see it" verses "didnt report it" If one of these girls post something even worse and your their facebook friend?