Yahoo just bought Tumblr, the popular blogging site, for $1.1 Billion in cash. This is great news, mostly for David Karp, the founder and CEO, who is now a very wealthy man. Rumors of the acquisition had been swirling all weekend and this morning Yahoo top gun Marissa Mayer announced the big news. So what's the new billionaire to do with all his luchini? Spend it, obviously.