A corporate blog reflects not just on the writer, but on the company as well. So, it’s reasonable to think that a company would assign the task of maintaining the blog to its best writers, and it would ensure that it is grammatically correct, correctly spelled, and accurate.
So, maybe Yodel Anecdotal, the company blog for Yahoo!, reflects the best the company has to offer. Perhaps no one at Yahoo! knows the difference between a fiancé (a male) and a fiancée (not a male). Perchance no one cares about the missing hyphens in 20.5-carat, groom-to-be, or mega-celebrity. Perchance, no one is capable of noticing a missing word or the redundancy in “and they also”:
Maybe, just maybe, this really is the best the company has to offer.