Many restaurants use Yelp or Zagat stickers as validations of their quality – displaying reviews on their windows functions as social evidence for customers looking for a dinner. Nordstrom is hoping that they can create an equivalent system for retail commerce via Pinterest. The store is tagging some of its most pinned items with the Pinterest logo in-store. It’s a way of telling customers that people want the product, as well as a way of indexing its digital popularity. The company has posted photos and instagrams of the experiment; so far its only in select stores, but it will be interesting to hear from customers in the near future whether or not they are more likely to purchase a Pinterest-tagged item.