Systemization of information into computer databases; price comparison services; providing consumers with product recommendations for business purposes; sales promotion for others; provision of an online marketplace for buyers and sellers of goods and services; personnel recruitment; administrative processing of purchase orders; organization of exhibitions for commercial or advertising purposes; online advertising on a computer network; display goods and services electronically for TV shopping and home shopping; presentation of goods on communication media, for retail purposes; providing customers with information and advice on choosing to purchase products; marketing the goods and services of others; book-keeping