At a conference on June 14, Facebook executive Nicola Mendelsohn predicted that the social networking site would be “all video” within five years. “We’re seeing a year-on-year decline of text,” she said. “If I was having a bet, I’d say: video, video, video.” Meanwhile, a recent article in The New York Times chronicled the lives of a group of young socialites – the “Snap Pack” – who plan their nights around snapping photos that can be shared with …