is a best practice to provide a welcome prompt, with a brief introductory tour of the app. This could be in the form of an overlay that provides quick descriptions of the functionality that might not be obvious (i.e., “swipe here to see more news”22), or a short tutorial, if a step–by-step description is more appropriate. In keeping with our warning about users' cognitive load limits, it is important to keep introductory tips brief and focused; no need to provide a full user guide detailing the full functionality and quirks of the app. The initial launch is designed to provide a quick
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