On-line advertising on computer communication networks; On-line advertising on computer networks; On-line advertising services for others; On-line art galleries; On-line auction services; On-line business networking services; On-line professional networking services; Operating on-line marketplaces for sellers of goods and/or services; Promoting the goods and services of others; Promoting the goods and services of others via a global computer network; Providing on-line employment placement services, namely, matching resumes and potential employers via a global computer network