Take a look at this fab infographic which states YouTube is the most powerful network. It’s more than just a collection of millions of videos, YouTube is a community. Even more than Facebook?
According to this infographic by Brendan Gahan, viewers are 20x more engaged on YouTube than Facebook. He took a look the top 5 from each and pulled the rate of comments per post or upload over a one week period. Brendan then chose comments as the sole indicator of engagement because comments are apples to apples. There are no dislikes on Facebook (but there are on YouTube, etc).
While brands have incredibly large Facebook communities, their average engagement rates (at least for comments) is significantly less than YouTube.