As of Friday, August 10, 2012 YouTube Now: Why We Focus on Watch Time. Yes, they have changed up the algorithm in how they decide on what videos to place as Suggested Videos.
I think to many people were trying to game the system by buying likes, comments and shares. Now, Youtube will see if people are actually watching the videos and how long they watch.
This just means that you need to keep your viewers engaged in your video. It doesn't mean that you make 8 billion 30 second videos and figure if people stay 30 seconds it means much. Youtube looks at the video length and will determine if the video is actually useful.
Youtubes goal is to have more people spending time viewing videos rather than searching and clicking.
You can see their full post HERE.
Now, all you need to do is grow big cleavage or get a really funny cat and you will be winner.