The actual problem is not that kids are using group communications technology, it's that the network effect in public interaction has been captured by private companies with a perverse incentive to maximize engagement.
That's just as much of a problem for adults as for teenagers and the solution doesn't look anything like "ban people from using this category of thing" and instead looks something like "require interoperability/federation" so there isn't a central middle man sitting on the chokepoint who makes more money the more time people waste using the service.
Humans survived well before the internet, the telephone, the telegraph, or even international post.
It's also assuming that we're willing to abandon a technological capacity (not having to personally travel to someone's location to communicate with them) that humans have had since before Moses came down from the mountain, which seems like a fairly silly constraint to impose when there are obviously better alternatives available.