The study comes from Zappos, a division of Amazon:

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.

Twitter referrals lead to $33 an order but Pinterest referrals lead to 75 cents an order on average?!

Wow.

Btw only a handful of people on Pinterest have 100k followers. Most have fewer than 1000.

"Valuation lowering comment from potential acquirer." Good point.

http://pandawhale.com/convo/5631/uh-oh-amazon-researchers-say-pinterest-doesnt-generate-a-lot-of-sales-business-insider