I voluntered at a summer camp for adults with physcial disabilities, and they had no policies on social media-- we also had some volunteers that were 16-17 year old high school students who volunteer there as well as volunteers who are as old as mid-60's. I never friended anyone I knew who were under the age of 18.
Most youth camps I worked at had a policy of not adding current campers on FB and you can not mention campers names on FB or tag current campers-- the same applied to CIT's. The execption was if you and the camper have a relationship outside of camp-- ie the camper is an immediate family member like brother, sister, cousin, and the like, but the Camp Director had to be made aware of this in advance.
If a camper becomes a staff member in a future year, most camps allowed you to friend them as long as you and the former camper- turned staff worked togeter.
Do any of you allow staff members to friend campers once they turn 18?