Hire competent journalists, writers and editors.
I've tried to read many Yahoo articles, across all categories, that were rife with grammatical and punctuation errors. I will find myself reading and rereading, going back a few sentences and rereading again in an attempt to understand what has been written. Words in the wrong tense, phrases missing a preposition, words that have no business being next to each other in the given context ... these are a few recurring errors I see regularly in Yahoo stories. Aim for professionalism. If you choose to maintain your status quo, then run a disclaimer stating that intelligent, educated readers will likely encounter difficulty comprehending many of the articles published on Yahoo. Your readers deserve better.