Oliver Rossi/DigitalVision/Getty ImagesMy 13 year old son sends me videos of people falling down. I watch them and I laugh, because apparently neither of us are particularly evolved.This is part of our relationship now. Someone eats shit while trying to unload their groceries, and my son thinks of me, and a little notification pops up on my phone. I’m not sure it's the exact mother-son bonding activity I envisioned when he was a baby, but here we are.I was reluctant to let him have Instagram. It took a lot of begging and persuading for all the reasons you are already thinking, plus a few more...