In order to truly succeed on YouTube, you need to approach it differently than other social platforms. Facebook, Instagram, and Twitter revolve around both creating and sharing great content with the goal of creating awareness, engagement, and conversation. (That’s a simple definition, but for the purpose of this argument, it will work for now). It’s about actually socializing.
“A series playlist allows you to mark your playlist as an official set of videos that should be viewed together. Adding a video to a series playlists allows other videos in the playlist to be featured and recommended when someone is viewing a video in the series playlist. YouTube may use this information to modify how the videos are presented or discovered.”