Remember when Google acquired Slide way back in 2010? A year after coasting smoothly down the chute into Mountain View, the social gaming company has finally begun to make a splash, launching Prizes (beta) last week, and now teasing Photovine, a social networking app that lets you connect with people through photo-driven themes. You could participate in a vine about your crazy weekend at the lake, join other users in a thread of kitten shots, or share unboxing pics of a n