All i know about Yahoo, is that when they rejected my application on cj.com, i sent them a letter to ask why, and support explained me and that was real email written by real person not a template. But when you communicate with google, i always get the same emails, never paid any attention on me from a real person, BUT i was not customer of yahoo, and i had a chance to talk to their employee by email, and i'm customer of google, i haven't ever had a chance, thats why i don't like google!
YPN is a complete bust. Maybe if they merge or get bought out, the next try will work. Crazy placements, like a Diabetes ad on a candy site