Tumblr has been a favorite for microbloggers. But with Yahoo's acquisition of it will things stay the same? Tumblr's profits, while being a popular company, have remained very low: Under $10 million a year. This was good for users because it meant that there was nobody to sue! For years the site was the bane for those protecting their copyrighted material. Yahoo, a major corporation, gives them somebody to go after. I wouldn't be surprised to see major changes from here on in as Y! protects itself and, also, monetizes the site.