Web site contact medium buy-sell large data sources to collect information the buyer. -Sales of goods and services Many shops open for business by the buyer-seller came into contact purchase-sale exchange information goods and services.
Website mediated communication - The large resources to crawl buyer - seller of goods and services by opening many stores allow buyers - sellers to make contact - New information products and services.
Intermediate contact site purchase and sale. Massive resources to gather information - seller buyer, goods and services, business shop of the buyers - seller in the purchase and sale. Data exchange of goods and services.