Happy or Not: How Smiley Buttons are Revolutionizing Customer Feedback | by Help.com | Helpdotcom | Medium
Simple customer feedback idea seen at Heathrow Airport from Happy or Not - The Actionable Futurist® Andrew Grill - Trusted Board-level Advisor & International Keynote Speaker
Airport customer feedback device - All the aeronautical manufacturers
Ready to push the Button? Instant Feedback for a Positive Work Culture | Mappalicious
Customer Satisfaction at the Push of a Button | The New Yorker
Push that button! User feedback made easy | brainybirdz