Social Network Content Sharing Conversion Rate

Sharing links among friends through social networks does indeed get a lot of traffic, but does the traffic convert? A recent study by StrongMail suggests that email is still the best form of sharing in terms of conversion rate. Here is the conversion rate measured

Email : 36.8%
Embedded Badges : 20.5%
Personal Links : 8.9%
Facebook : 3.2%
Twitter : 0.4%