The document discusses building an interactive digital out of home experience using mobile and social media. It outlines three key considerations:
1) Interactivity needs to be in real-time to engage users, with responses within 5-10 seconds for a good user experience.
2) Systems need to support "fly-by texters" who can interact without signing up, while also allowing richer engagement over time.
3) The call to action prompting interaction is important and needs to be clear, compelling, and framed around an enticing topic or question to encourage responses.
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