The Yahoo logo is shown at the company's headquarters in SunnyvaleSAN FRANCISCO (Reuters) – Yahoo Inc's board has licensed a deal to buy blogging and social networking web page Tumblr for $1.1 billion in cash, the Wall Street Journal cited folks aware of the matter as pronouncing on Sunday. Such an acquisition could be Marissa Mayer's biggest deal on account that taking the helm of the once-iconic Internet company in July 2012. Yahoo is enthusiastic about fast-growing Tumblr as a result of its younger consumer base would bolster the older site's "cool issue," the know-how blog AllThingsD referred to the sources as announcing. …