Compared to the last boom/bust technology cycle that culminated with the dot com crash of 2000, the social-era combatants are in an even more precarious position. Back then, the engine of the expansion was e-commerce, which at least generated revenue (although clearly not at ROI sufficient to save Pets.com, Webvan.com, Boo.com and legions of other online ghosts). Last time, success and failure was driven as much by expense control as revenue generation, and the huge influx of public market financing through IPOs allowed start-up companies to essentially trade dollars back and forth in a giant shell game.