I love Youtube Highest Rated Comments.
One interesting side effect to this is the increase in “digital cyphers”. A digital cypher is when Youtubers freestyle rap in the comments section over the music video clip that is playing, usually these are over instrumental beat to a famous song (examples here here here). Highest rated comments motivates people to rap comments as the best ones will be ‘liked’ and go to the top of the page and showcased to everyone else who is viewing that video.