Why We Post Nothing About Our Daughter Online
slate.com
slate.com
"When we think she’s mature enough [...], we’ll hand her an envelope with her master password inside."
Which probably means about 1-2 years after she has already created her own accounts on whatever social network/apps she wants to join (and on her own terms) ;)
This framing of the privacy discussion puts it in biblical terms; most of society is trading away their privacy birthright without thinking in a way they might regret.