Google data centers in late 2013 and began selling off the barges in 2014. Most of the software stack that Google uses on their servers was developed in-house. According to a well-known Google employee, C++, Java, Python and (more recently) Go are favored over other programming languages. For example, the back end of Gmail is written in Java and the back end of Google Search is written in C++. Google has acknowledged that Python has played an important role from the beginning, and that it continues to do so as the system grows and evolves. The software that runs the Google infrastructure includes:
Yahoo! May 19, 2013 the Yahoo board approved a $1.1 billion purchase of blogging site Tumblr. Tumblr's CEO and founder David Karp would remain a large shareholder. The announcement reportedly signified a changing trend in the technology industry, as large corporations like Yahoo, Facebook, and Google acquired start-up Internet companies that generated low amounts of revenue as a way in which to connect with sizeable, fast-growing online communities. The "Wall Street Journal" stated that the purchase of Tumblr would satisfy Yahoo's need for "a thriving social-networking and communications hub." On May 20, the company announced the acquisition of Tumblr officially and