Mobile Ads Could Make or Break the Yahoo-Tumblr Marriage

Will marketers buy in?

Yahoo chief Marissa Mayer's $1 billion bet on Tumblr is undergoing a fresh wave of scrutiny thanks to a disgruntled investor as well as persistent questions from marketers. And later today when she discloses Yahoo's third-quarter earnings, Mayer is expected to unveil a fresh plan of attack for her company. It will be intriguing to see where Tumblr falls into the mix, as there are signs that the union may ultimately yield promising new mobile opportunities.