I want to create a dating app that:
My questions are:
here_nowAPI. The pictures don't have to live in your database as you can pull them directly from FB and maybe cache them locally.
I am certain you have some follow up questions, so feel free to ask and dig deeper on any of this.
Check out my pubstrap-chat example here, which involves Facebook and PubNub. https://github.com/pubnub/pubstrap-chat/blob/master/examples/facebook.html
For private channels, consider this example: http://www.pubnub.com/blog/create-private-chat-demand-connecting-users/