OP Here. Just wanted to add that I think this is of particular interest to the HN community because the iOS app, which conforms to the open protocol, allows any developer to create a web service with a complying API to receive social content. What you do with the content thereafter is entirely up to you.
This looks great! Really inline with everything we're doing with IndieWebCamp (http://indiewebcamp.com/principles) The app looks really well designed, I'm impressed!
We've been making progress on a way to sign in to apps like this using your own domain, where the app can then discover the posting endpoint. I'd love to chat more about this! I'm in the #indiewebcamp IRC channel on freenode.net if you'd like to chat! http://indiewebcamp.com/IRC
Thanks very much Aaron. I took a look at those principles and it was a reassuring list that I might be doing something right :) I'll try and reach out in the next few days once I've had more time to read about indiewebcamp.