OAKLAND , Calif. — Like many of today’s post-Y2K teenagers, Maia, a preternaturally composed and thoughtful young woman from the San Francisco Bay Area, can rattle off her old screen names and social media accounts as easily as her birth date.

First, there was the Gmail account her parents started for her when she was 9, after she returned from camp feeling left out because she had to give new friends her mother’s email. A couple years later, there was a YouTube channel where she attempted to mimic the vloggers who had become her celebrities. Most formative was probably the Instagram account @mxmtoon, where Maia was commissioned (free of charge; she was 11) to do cartoon drawings for strangers on the internet.“I think I got up to, like, 500 followers on Instagram,” she recalled, before the demand got too overwhelming and she let the account fizzle out.

In the time since, Maia, now 19, has tried it all, and stuck with most of it: Tumblr. SoundCloud. Facebook. Vine. Twitter. Snapchat. Bandcamp. Pinterest. Twitch. TikTok. And so on.

Along the way, her parents, both tech-savvy educators, warned of the obvious perils of living publicly. “We were really very clear about wanting to make sure that our kids understood their footprint,” said Maia’s father, Cameron, in the family’s kitchen, before Maia chimed in, mocking in a singsong voice a line she’d obviously heard dozens of times: “Everything you put online is online forever.”