Viral marketing or word of mouth marketing is a vital marketing tool during times of economic downturn where your budgets are limited. No wonder then that word of mouth marketing has seen a terrific rise in spending even during these times of economic slump. Here are the expenditures in recent times:

2008 : $1.54 billion
2009 : $1.7 billion

US word of mouth marketing spend grew by a CAGR of 37.6% in the period 2003-2008 and is projected to grow at a CAGR of 14.5% in 2008-2013 period.

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