Mobile mashups combine free or low-cost data sources and services to build mobile applications. Examples include apps that use Twitter data, maps, photos, and weather reports. Good mobile mashups are fast, efficient, beautiful, and have a fun marketing hook. While technical skills are needed, successful apps also require effective marketing through blogs, viral features, and getting influential users to spread the word. Mobile mashups are an area Yahoo is interested in because it provides opportunities to utilize Yahoo's open data and talent, as well as potential acquisitions of popular apps.