With a $16 billion IPO behind it and its billionth user on the horizon, Facebook has made it hard to imagine a world without it. But Steven L. Johnson, who teaches social media innovation at Temple's Fox School of Business, says it's doomed to fail. The once-clean interface is cluttered; better applications are taking off even faster than it did; and Facebook’s fundamentally flawed model of social interaction is based on the idea that everyone has a single social identity. "The technology graveyard is full of former market leaders like Netscape, Geocities, and AOL, all of which failed to provide the next big thing. The odds are that Facebook will, too."