Instagram introduces the emoji slider for poll questions you ask friends and followers
When one of your friends or followers answers your question with the emoji slider, they will slide it to the left or right until the emoji reaches the level that matches their answer to your question. Once they let go of the emoji, they will see the average response from others who have responded to the question. According to Instagram, using the emoji slider will "help you get closer with your friends and followers."
The update that brings the emoji slider to Instagram is rolling out now to version 44 of both the iOS and Android app. If you don't have Instagram on your phone, click on the appropriate link: (iOS|Android).