An app that encourages teens to be nice to each other has been acquired by Facebook for an undisclosed fee.
The app - called tbh, meaning "to be honest" - is just nine weeks old, but had already been downloaded five million times.
The app's creators said it will remain a standalone program but will now have more resources thanks to Facebook.
Tbh's achievement has been to create an app that has not descended into a cesspit of trolling and harassment - something many apps before it have dramatically failed to do.
The acquisition has been welcomed by a leading anti-bullying charity.