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:
History of Yahoo! revelation date. Data collated by comScore during July 2013 revealed that more people in the U.S. visited Yahoo! websites during the month in comparison to Google websites—the occasion was the first time that Yahoo! outperformed Google since 2011. The data did not incorporate visit statistics for the Yahoo!-owned Tumblr website or mobile phone usage. On February 11, 2014, Yahoo! has acquired a social diary company named Wander. On February 13, 2014, Yahoo! acquired Distill, a technical recruiting company. On September 22, 2016, Yahoo disclosed a data breach in which hackers stole information associated with at least 500 million user accounts