The first thing I say needs to give credit to the developer. The app is really fleshed out, and well designed. My expectations for a fledgling startup social network was a poorly designed app, but that is not the case here.
I have a couple pieces of feedback about the UI though. The newsfeed takes a bit long to load up, and I had to flip between the different tabs on the bottom to get the newsfeed to load finally.
Second, the app doesn't allow for the swipe-in-the-left-edge gesture to go back one level in the app.
Otherwise this is really well designed app, and its success will be determined based on the amount of users it can attract.