what for? wasn't a company supposed to earn money? correct me if i'm wrong, but i still expect that as the ultimate goal as an entrepreneur. everything else till now was an expensive hobby by david karp. well ok, he at least finally earned big money, the craziness of it all.
but yahoo will have to bring it to market, in other words: push ads and pull user data. with that setup, good luck earning your billion back and profit from tumblr.