“Pinterest is not a social media network,” insists Anna Bennett, a well-known Pinterest expert. Of course, the online platform, whose users “pin” links and images to virtual bulletin boards, has social elements—users can share and comment on pins, and follow and be followed by others.  But Bennett means that almost no one goes to Pinterest to chat with pals or catch up on news. They go to shop. It’s a distinction brands should take to heart, says Bennett, who teaches Pinterest Marketing for Business on her website, WhiteGloveSocialMedia.com. “On Pinterest, you don’t hav