The present invention is an instant message service (“IMS”) based interactive information, marketing and sales system, which provides a Merchant or Seller with a means to rapidly and effectively communicate with its customer base in order to facilitate the sale of a product or service from a Merchant's website to a customer via a customer's mobile computing device. The system represented by this invention is a voluntary, opted-in system, by which the customer provides its mobile telephone number or the telephone number of its chosen mobile device and the instant messaging system that the customer is using on its mobile device, to the Merchant or Seller. A customer then requests that the Merchant or Seller forward specific information to the customer concerning a particular product or service being sold by the Merchant or Seller. The present invention permits the customer to request that certain product specific information be transmitted by the Merchant to the customer's mobile computing device via an instant message service (“IMS”) message, as soon as said information becomes available.The present invention permits the Merchant or Seller to transmit a URL link from the Merchant's website to a customer's mobile number via instant message service (“IMS”) message transmitted directly from the web site page. Once received, a customer can then interact directly with a Merchant or Seller, from a customer's mobile computing device, via the instant messaging service. This permits a customer to make inquiries about products or services, make offers to purchase or even to enter bids in online auction environments. The present invention permits a Merchant or Seller to forward via instant messaging service (“IMS”) message, a URL link which contains a short cut Icon to reside on the home page of the customer's mobile computing device, which when clicked, will act as a short-cut to the Merchant's web site. Also, this present invention permits a Merchant or Seller to forward via instant messaging service an instant message containing a URL link, which when selected by a customer permits the customer to immediately purchase a product or service from its mobile computing device.