Benny and Rafi Fine have been turning YouTube into their own personal industry for the last 10 years now, having used it to not only upload videos, but to springboard their careers into film and TV production, as well as assisting smaller YouTubers by acting as producers, marketers and running partnerships to help people grow their own channels. TheFineBros most popular series is the "X Reacts To" which takes various groups and subjects and gets them to watch or view something, before filming their reactions. It's unerringly simple and in most cases can be absolutely hilarious, such as Kids React To The Harlem Shake or Elders React To Dubstep. The simple concept has gained them millions of subscribers and over a billion views, cementing them as a true YouTube success story. Subscribers: 8.4mLifetime views: 1,670,603,284Annual Channel Earnings: $5.2m