Operating on-line marketplaces for sellers of goods and/or services; advertising and directory services, namely, promoting the online marketplaces of others by providing a webpage featuring links to the websites of online marketplaces of others; Exchange services, namely, bartering general merchandise and general consumer and commercial goods of others; Computerized on-line ordering featuring general merchandise and general consumer and commercial goods and services; Providing an on-line commercial information directory; Providing a searchable on-line advertising guide featuring the goods and services of other on-line vendors; Database management services; Advertising services, namely, providing advertising in the nature of on-line and electronic classified directories and video and audio advertising and marketing; Electronic auction services via the internet; On-line auction services; providing a website where users can post ratings, reviews and recommendations on products and services, namely, evaluative feedback and product ratings of consumer services of others in the field of rating sellers' goods and services, the value and prices of sellers' goods and services, buyers' and sellers' performance, delivery, and overall experience in connection therewith; Providing video and audio advertising and marketing services