Hello, i'm very very interested on your project!.
The Augmented Reality & Virtual Reality Apps are my main field has developer, i have 2+ Years working with them and i have lot of interest of learning everytime more.
I have my own licences to publish on markets & build the application, we will be using Unity3D & Vuforia SDK.
I have lots of experience using the Facebook SDK too so, will be no problem to put on work all those tools in the same rail.
To being honest, i don't know how to you want to put your friends on AR and it's for that why i am interested on your project!
I will wait for your message.