This Twitter post / ad from Darrelle Revis of the New York Jets is a reminder that ads need to be relevant. And relevancy is a function of voice AND message. This is precisely why I am bullish on Facebook Ads and Google +1. Darrelle Revis is a star and he's got a strong twitter following (160,000). But neither of those qualify him to be a Motorola Xoom spokesman who raves about the 10.1" HD widescreen. Traditional commercials might allow for more creativity - but when Revis touts the Xoom in text, it is neither authentic nor convincing. I would much rather hear a techy voice and/or friend praise the Xoom (much more compelling) or here Revis talk about products / brands more relevant to him.
... and this has nothing to do with the fact I dislike the Jets =)