The document discusses the growth of mobile usage of Zillow's real estate services. Some key points: - Zillow has nearly 64 million monthly unique mobile users across their 25 mobile apps. - Mobile traffic accounts for 60% of all Zillow traffic and users view homes 3x more on mobile than desktop. - Mobile usage peaks in the evenings and weekends when people are more likely to search on their phones. - The document advocates for optimizing mobile marketing strategies by testing different ad networks, formats, messages and times to maximize conversions.