EMarketer forecasts that worldwide social-network ad spending will rise 31% this year, to $3.3 billion. Next year, ad spending on social networks is expected to increase an additional 29%, to nearly $4.3 billion. The U.S. share accounts for just over half of that total. But in 2011, "U.S. dominance will start to wane and international social network ad spending will increase more rapidly," said eMarketer senior analyst Debra Aho Williamson. "As Facebook and other social sites expand their worldwide presence, they will become more attractive to marketers that want to buy ads across multiple markets."
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