On-line trading services in which a seller posts products to be auctioned and bidding is done via the Internet; Providing a searchable on-line advertising website and guide featuring the goods and services of other vendors via the Internet; On-line auction services; Operating on-line marketplaces for sellers of goods and/or services; Providing a website featuring an online marketplace for exchanging goods and services with other users; Providing a website featuring an online marketplace for e...