Billboards
Have you ever driven past an interesting billboard and then forgotten what the message was only seconds later?  What if that billboard had an easily visible five-digit number posted on it so that any passer-by could text-message to receive an automatic response from the company on the billboard?  Not only would the automatic reply from the company serve as a reminder to that person about the business or product, but it could also relay a message to have the company contact that person directly.
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