Google has officially launched its photo-sharing iPhone app called Photovine, which they first revealed back in July. The app lets you share images based on themes or in this case, "Vines." It aims to integrate more social elements to encourage photo sharing and create "a fun way to learn more about your friends, meet new people, and share your world like never before." So, how is it different, better, or worse than other photo-sharing apps? Well, let's take a closer look.