Pop Went the Social Media Bubble. Now What?

There's no doubt as to when the dot-com bubble popped: it was on March 10, 2000, the day the Nasdaq peaked at 5,132.52. But when exactly did the social media bubble pop? Was it Nov. 23, when Groupon shares fell below their $20 IPO price or this week, when they neared $5? Was it May 18, the day of Facebook's IPO fiasco? Was it even more recently, when Facebook shares dipped below $20 for the first time or the day Zynga's began trading at less than $3 each, a whopping 70% below their offering price? Hard to say. But pop, it did.