he's not there yet, but we've talked A LOT about being smart with what is said on youtube
he takes it in as much as a 9 yr old can
but he's the kind to see a Mark Roper video and immediately try to put grappling hooks on his toy drones to make it pick up/drop things off - he throws himself into things
but even from the time when he was little, i just had the sense that he was the one we needed to watched with addictions and other experimentations