People tend to act different on the internet. The things people my age post on facebook is ridiculous. (im 18 btw) Some "like" pages about weed and beer and stuff and they are clearly underage. No employer will find it as amusing as them im sure.
Im friends with my parents, fellow arrowmen, my fellow camp staff members, scout leaders, younger scouts from my troop, my boss at camp and even my Grandma. So Before I "Like" or post anything I try to think how the various people may interrupt it.
As for would people be able to tell I was a scout? With all my pictures I have up, groups I belong too , friends I have and my about me section I think people wouldnt know I did anything els, but im odd like that lol.
People just need to remember to be safe on the net. Nothing is private and people are honest all the time.