Hi i have created exactly same application for another client , so i have read code for you . With FB login , Like and Shear functionality, Live notification, Chating Option ,
it is directly integrated with website but still FB login is device based and "one click" registration.
you can see app on given link : name "yvere"
I can give all of it in one to two days
Looking forward to message from you for more details , Have a nice day