Yahoo, on the other hand, has stubbornly continued to be a media company with dollops of technology layered on top, though not nearly as well or as consistently as Google and Facebook. (Yahoo reported a dismal quarter Tuesday and said it would sell assets and reduce its workforce.) One of Marissa Mayer’s signature media moves in her three-year-plus year tenure as CEO was to buy the blogging platform Tumblr for $1 billion. Yahoo wrote down the value of Tumblr and other acquisitions for a total of $4.4 billion.