My now 14 yr old had it when she was 12. The rule was that she had to allow certain people to follow her/friend her.
Prior to having kids I was a Girl Scout and Cub Scout leader--you know back when I had copious amounts of free time
Those "kids" are all now young adults. Over the years they have babysat for me and I've kept in touch with many of them. Those are the people that my kids have to be friends with/allow to follow.
I've gotten texts from them with screen shots letting me I needed to talk to my kid.