Providing an online marketplace to advertise real estate, mortgages, land, property; advertising, promotional and marketing and advertisement services; advertising services related to real estate; business management of real estate for others; provision of marketing in relation to real estate via an electronic bulletin board; real estate auctioneering; real estate brokerage listings; listings of homes and other real estate for sale, including on behalf of others via the Internet; advertising, marketing and business consultancy services all related to real estate; provision of information, news hints, and strategies about marketing of real estate via an electronic bulletin board