I was on a train from Chicago to Detroit a week ago and there was a group of about 10 high schoolers sitting behind me. We got talking about iPhone apps and I asked what was popular.
They all agreed Facebook was not as cool anymore and confessed to being addicted to messaging apps that their parents couldn't check up on like they could with texts. Snapchat, Kik, and Whatsapp were among those mentioned.
It's interesting because if you look at these apps in the App Store, the screenshots are definitely targeting that age demographic as well.
Facebook is losing ground fast for this age group. The group that has grown up using Facebook and is now moving on to other mediums. This release looks very promising in helping to win back that interest.