Taylor Lorenz/nytimes.com

Bathrooms are “the perfect stage set” for TikTok videos. “Most home bathrooms are well lit and have nice, bright acoustics. Unlike the kitchen, living room or even bedroom, bathrooms are private spaces, where parents and siblings are trained to not barge in.” Also, that big mirror is great for filming selfies.

“Spending a lot of time on TikTok, and it seems that knowing how to film yourself speaking with a cellphone in a bathroom mirror is a new skill to be mastered,” Jon-Stephen Stansel, a digital marketer, tweeted. “It’s like a stand-up learning to work a microphone, it’s part of the craft.”