This crisis has given rise to a significant increase in marketing efforts for Masking Up$.$ As a new marketing technique, the company turned product usage into a challenge by encouraging consumers to post pictures on social media of themselves at work in their Masking Up mask. Every week, an individual is chosen randomly from those who posted pictures to receive a $$250$ Amazon gift card. This has proven to be a very effective marketing technique. What is the terminology for this kind of response?

Positive user response, because many customers reacted by posting pictures of themselves in masks

Gambling growth, because the marketing team had never tried it before and was uncertain whether it would work

Social media surge, because the competition increased social media mentions for the company

Growth hacking, because the competition was a creative and unexpected way to grow the company$$s business