From August 30th, 2017 to April 6th, 2018, 50% user give 5-star rating, 50% user give 2-star rating. for Twitgage - Engagement Calculator for Twitter chrome extension.
Ran calculator on same page for same period of time multiple times and got vastly different results each time.
Words good! Wish it could tell me how the percentage is performed and the result stays on the screen for as long as needed.