On-line business networking services; On-line buyers guide service providing information in the field of Roof Owners, Solar Systems, Installation and Management; On-line ordering services featuring management and operation of funding and installation of solar systems on available roofs that can act as hosts; On-line services, namely, ordering and inventory monitoring for Matching subscribers to a suitable roof of hosts and online collecting fees and provisioning payments to users; On-line tracking for others of service contracts for residential appliances and consumer goods for business purposes; Online advertising and marketing services in the field of Online services and platform for connecting roof owners, subscribers and other users so as to allow managing interaction between them.; Online advertising and marketing services in the field of Roof Owners and Solar Systems via wireless networks for display on mobile devices; Online service for connecting social network users with retailers for the purpose of facilitating discounted purchases; Operating on-line marketplaces for sellers and buyers of goods and/or services