Face it, some smartphone features are half-baked and simply aren't ready for mainstream use. Siri comes to mind, of course, but the Galaxy S III has its fair share of gimmicks as well, particularly those features that work only with other S3 phones.
ShareShot, for instance, lets S3 users share photo galleries via Wi-Fi Direct, a technology that allows Wi-Fi devices to interact without a wireless access point. And GroupCast enables content sharing (e.g., photos and presentation slides) between S3 phones, or between an S3 phone and a DLNA-enabled TV. Good ideas, certainly, but ones that need to work across all mobile platforms and devices to be truly useful.