Earlier this year, my younger daughter, who’d just turned 9, started asking me to install an app on my phone called TikTok.There are a lot of apps my kids ask to try from time to time on my phone or their iPad, from games where you drive dangerously around in a honking virtual car to “Harry Potter” stuff to word scrambles and puzzle apps. My older daughter of late has started playing with home design apps, no doubt inspired by her addiction to HGTV’s [...]