Instagram also has a direct message ability, like Facebook and twitter. Direct messaging is like texting behind the scenes. One friend found "mean girl" type messages about others between her daughter and another friend. Another friend found pictures of homework (in direct messaging) a girl was sending to her son, so he could cheat off of her.
My goal is not to put parents into freak-out mode and go ballistic on their kids' technology. My goal is simply to make parents aware. It's become clear to me in conversations with friends that we must share with each other what we know, because our kids are much smarter than we are regarding technology. They probably always will be, but it's our job as parents to protect them and keep them on the path that God has for them. When they wander off the path, and they will, we can be aware of it if we know where to look.
Happy Independence Day, friends!