I cleaned up my site a lot after the Penguin update and now I have to say, Yahoo & Bing definitely doesn't like me now.

I used to be within the top 3 spots on the first page. Now you can't even find me within the top 3 pages!

Still I am ranked at number 10 in Google (down from 1), but I don't understand what changed Yahoo's opinion of me.

Does yahoo think a site isn't trusted as much when there are a lot of site wide changes?