Users referred by Facebook spend more on Zappos than those from Pinterest

"Zappos already lets users share what they buy through Facebook Inc. (FB), Twitter Inc. and Pinterest. While consumers share more often on Pinterest than on the other two social networks, sales from Pinterest posts contribute the smallest amount of revenue, Young said.
Zappos users were 13 times more likely to share a purchase on Pinterest than on Twitter and 8 times more likely to share on Facebook than Twitter, Young said. Even so, posts on Twitter brought in the most revenue -- an average of $33.66 an order -- while Facebook posts garnered $2.08 per order and sales from Pinterest were 75 cents on average, he said.
“Even if a person has 100,000 followers on Pinterest and she pins something to a board called ‘Stuff I Love,’ that’s not as big a deal as an endorsement tweeted to 10,000 followers,” Young said."

Source:  Bloomberg, 29th August 2012