You're a big company. Imagine you had a simple user interface built into the coffee machine in your workplace's kitchens. You can ask every employee a question or two every day (and they'll answers). What would you ask?
"What is the most positive action by a fellow employee that you noticed?"
There is a cultural bias in companies for employees to spend a lot of time complaining (or whinging as the Aussie's say) which focuses attention on negativities. There is a need to systematically counteract this bias, and asking for a focus on the positive or "bright spots" will do so.