IMHO a photo-sharing app with social features it shouldn't be platform-specific from the beginning. I wish them good anyways and I'm curious if/how fast will this product succeed. Twitter has succeeded on it's limit of 140 chars, maybe this one will do it too on it's 50 friends, the idea seems kind of cool and simple.
Sure, but of all the arguments for native-apps, seamless integration with camera taking functionality is a worthy one.
To build something that integrates with the camera requires platform-specific solution (says a disgruntled but understanding Android user who can't use Path yet either)
