No idea. I remember when they first put it in they wouldn't tell me at all other than through my analytics saying that my views came from "youtube advertising" I haven't gotten a view from that traffic source since June 2014 though. When it was working for me it would randomly shut off too. It would work for about 2 weeks and then it would stop showing where I had to basically delete it as my fan finder video and re-submit it to get it to show again.
I still have a video set but I feel it hasn't been shown at all which makes me wonder what the point of it even is.