Advertising and directory services, namely, promoting the services of others by providing a web page featuring links to the websites of others; Advertising and marketing; Business services, namely, registering, screening and verifying the credentials of third-party vendors, suppliers and contractors on behalf of others; Online advertising and marketing services in the field of construction, home or building contractors, and businesses; Professional credentialing verification services in the field of businesses, professionals, construction, home or building contractors, namely, verifying the skills and knowledge of licensed professionals on behalf of others; Providing an on-line commercial information directory on the internet; Providing on-line trade directory services; Verifying and monitoring the credentials of businesses, professionals, home contractors, building contractors for business purposes