To be honest I was unaware that yahoo answers was actually that popular. I've never really used the site. I've come across YA in search results but very often the questions asked were either unanswered, answered inadequately, spammed, spam themselves, or answered but shouldn't have been because the question was superfluous.
Having said that... I'd still have to say no. My reasons are that HP Questions are only of interest to a specific group of people. All of those people are on HP.Also I don't think I've ever seen a HP question in a Google search.
But then what you should really be asking is do you want it to be that "popular?"