Are you happy that Google's new Play Services software for Android developers is out? If not, one of the new features may tell you to turn that frown upside down. Google's latest APIs for Android apps include "Mobile Vision" face detection and "Nearby Messages" notifications. Mobile Vision works with video or still images to detect faces at any angle or orientation and determine if a person is smiling or has their eyes closed (see the video, below). Google points out, however, you won't be able to go all Enemy of the State, because it's not a facial recognition app.