I was browsing around on You Tube and found some niche channels that are getting millions upon millions of views. I mean into the billions. However, I noticed that these channels have no linked social media accounts other than their google plus profile. I really find it hard to believe they can get so much traffic just by optimizing their channel and video. Heck, I don't even think its from advertising because they would have to spend millions of dollars to get that kind of traffic. Any ideas how they get this kind of traffic? Might they just be buying views or is there some other way?