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Youtube has been a problem and we have had many discussions about what's worth her time and what definitely isn't. We limit the app specifically to 1 hr. per day, and just kinda keep tabs on what she's watching and talk to her about it.

Putting faith in any app to curate or restrict content in Youtube and the like; for this one I think doing the human thing of talking to her regularly and even making it clear that we will be checking out what she's doing is preferable.

Long-form video game retrospectives is my favorite

There should be a way of limiting your kids' YouTube viewing to only certain channels, so they can watch Kurzgesagt and music instruction videos (for instance), but not all the other crap. Perhaps a third-party app could offer this feature for parents.

Probably messaging their boyfriend or girlfriend, like most fourteen year olds do.