Silicon Valley is exploding with ambitious young tech startups these days. Companies like Twitter and Snapchat have skyrocketed into billion-dollar territory in less than a decade. But the higher the price tag, the steeper the fall. File-sharing giant Dropbox suffered several hours of a power outage last week, a technical glitch that no billionaire company can afford. But some suggest that this may be a symptom of the tech industry getting rich quicker than it can maintain. Remember VA Linux, whose shares jumped 700 percent in its first day? Neither does Silicon Valley, which offers no job stability for startups.