Film promotion has changed over the years. Sure, there are still posters, trailers, TV spots, and radio and print ads, but now there's also Google+ -- at least for Ender's Game. The upcoming film, based on Orson Scott Card's award winning sci-fi novel, is using the social network to tease fans -- flaunting a brief peek at the film's trailer and advertising a Google+ Hangout with the film's creators. Leading actors Harrison Ford and Asa Butterfield kicked off the hype machine by introducing a teaser trailer for the film, promising the full preview as a Google / YouTube exclusive next week. The entire clip (introduction included) falls under a minute, just long enough for die-hard fans to cry "the book is better." You can take your continuity complaints to the film's director, producer and star on May 7th.