Providing on-line non-downloadable software for generating, managing, updating, posting and sharing advertising on social media; platform as a service (PaaS) featuring computer software platform for generating, managing, updating, posting and sharing advertising on social media; providing online non-downloadable software for tracking, managing, and optimizing advertising and promotional campaigns, and calculating return on investment in connection with the same; providing platform as a service (PaaS) services featuring computer software platforms for tracking, managing, and optimizing advertising and promotional campaigns, and calculating return on investment in connection with the same; platform as a service (PaaS) featuring computer software platform for use by real estate agents for the purpose of placing digital advertising, managing digital advertising campaigns, optimizing advertising impressions, targeting advertising to customer populations, tracking, analyzing, and reporting on advertising campaigns, and managing advertising inventory; providing temporary use of online non-downloadable software for use by real estate agents for the purpose of placing digital advertising, managing digital advertising campaigns, optimizing advertising impressions, targeting advertising to customer populations, tracking, analyzing, and reporting on advertising campaigns, and managing advertising inventory