Americans spend close to 17% of their time on all internet time on social networks. A year back this was close to 6%. Here is a YoY growth in ad spending on social networks by industry:

Entertainment : 812%
Travel : 364%
B2B : 184%
Automotive : 178%
Health : 143%
Web Media : 139%
Software : 128%
Financial Services : 98%
Public Services : 93%
Telecom : 89%
Consumer Goods : 75%
Hardware/Electronics : 56%
Retail Goods : 55%

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