I wrote about Facebook's unselling Messenger for Kids app.
On Messenger Kids, a parent creates an account for a child, establishes a familial relationship within the app, and then begins building their child’s social graph by adding contacts. Notably, the parent is asked to provide their child’s real name. Facebook says it has no plans to turn these shadow accounts into full-fledged Facebook profiles. And yet the data it collects could be useful for ad targeting elsewhere on the service. And should Facebook amass hundreds of millions of underage users, the company will have every incentive to offer one-click exporting of these accounts to real ones on the day the child turns 13.