How to register complaint on Yahoo software release?

I am disappointed with Yahoo’s newest release and the lost ability to review/find my comments across new articles. While I receive Y! Updates this is a poor substitute as it does not show any thumbs down and not available in real time. This ability to dialogue on current and breaking news is the primary reason I use Yahoo over its competitors. I, along with thousands and thousands of others, want to register this complaint with Yahoo so the company knows why we’re now going elsewhere for our news.

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