pigrabbitbear writes "Those who continue to inflate the tech bubble will be quick to remind us all of how they've learned from the past. That this time, it's simply different. They do have a point. Silicon Valley (and Alley) have matured. Startups these days are focused, driven, and efficient, creating products that people actually use. In a period of less than a year after its launch, Instagram was used by 5 million users, who by August of 2011 had uploaded 150 million photos. But even with these impressive results, it's impossible to ignore the fact that many of the fundamental economic factors that led the first bubble remain." A couple other readers contributed similar articles — Instagram's sale seems to have solidified the idea for many that we're in the midst of another tech bubble, though some are more certain about it than others.