AllFacebook – "Report: Shoppers Prefer Dealing Directly With Retailers Vs. Purchasing Via Facebook"
How effective is Facebook as a marketing tool for retailers? It depends which study you believe.
According to RichRelevance, Facebook is dominant as a source of traffic for online retailers, and shoppers who enter retail sites via Facebook browse more pages and make more total purchases, but shoppers driven to those sites via Pinterest spend more money.