Fotofest's The Art of Social Media: A Conversation on Media Collision, taking place Wednesday night at 6 p.m., promises to be informative and entertaining on more than one level. Part of the title, Media Collision, sounds pretty entertaining by itself, conjuring up visions of MySpace, Facebook and Twitter crashing full-speed into each other in some other spatial dimension.The "happy hour lecture", designed to help artists tame the wild west of social media sites and harness their advertising po