Advertising, in particular, Internet advertising; intranet advertising and extranet advertising; procurement of contracts about purchase and sale of goods for third persons; Operating marketplaces for sellers of goods and/or services via Internet, intranet, extranet; Operating marketplaces for sellers of goods and/or services via Internet; intranet and extranet; Operating marketplaces for trading contracts for purchase and sale of goods and services via Internet, intranet and extranet