Young people aren't reliable predictors of tech trends. So where does that leave Snapchat? We thought you might want to see it. Young people aren't reliable predictors of tech trends. So where does that leave Snapchat?on.wsj.comWe all tend to assume that young people are on the technological vanguard, knowing what "the next big thing" will…

Young people aren't reliable predictors of tech trends. So where does that leave Snapchat? We thought you might want to see it. Young people aren't reliable predictors of tech trends. So where does that leave Snapchat?on.wsj.comWe all tend to assume that young people are on the technological vanguard, knowing what "the next big thing" will…