see comment by Melissa Fuller re your concenrs last week. it seems that internal discussions at your school could be a starting point. Maybe seeking out teachers in other schools to establish a student blog or wiki that is by invitation would be another possibility.
Virtual spaces can work for this as well with, as Melissa has suggested, the use of avatars and cyber names to protect identity.
Thanks Nicole. It's great to see you in here and I appreciate you sharing your ning experience and think that you have raised valuable issues regarding autheentic audience and assessment.
Perhaps you could check out the contributions in the Digital Diversity Conference Feedback Group or start a new discussion thread to give others in the group the chance to join you in this conversation.