This week American Express and Twitter announced a partnership to purchase via hashtag. For American Express customers that want to tweet to buy, they must first sync their American Express card with Twitter. The service will only work with compatible American Express cards (no prepaid or corporate cards) and a public Twitter account. Here’s how it Author informationMichelle Stinson RossSocial Media Consultant at Firestarter Social MediaMichelle is the co-host of the popular Social Media discussion group #SocialChat, blogger, and Social Media Advocate/Consultant +Michelle Stinson RossTwitterFacebookGoogle+LinkedInThe post Twitter as Point of Sale? appeared first on Search Engine Journal.