(Photo : Flickr/Adrienne Hoffman) Amazon online shopping site Amazon is now rolling out a way for some sellers on its site to personally engage with customers. This sudden move represents Amazon's departure from its tight controls over customer data. Amazon's latest feature for sellers Last week, Amazon began piloting a tool that enables brands in the United States that are a part of its Brand Registry program to email marketing materials to customers who have chosen to follow their brands. Brands can then send notifications to the customers when they launch a new product or if they have a promotion.