Email marketing has a huge ROI and American online retailers make good use of it. But they are also hoping to make the email campaigns go viral with social media options inside the email newsletters. This is how the different social networks are preferred for triggering word-of-mouth publicity:

Facebook : 100%
Twitter : 67%
MySpace : 44%
Digg : 33%
Delicious : 11%
ThisNext : 11%
StyleHive : 11%

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