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:
Internet censorship and surveillance by country demonstrating its high sensitivity to defamation and other "inappropriate" online content, which has resulted in the closure of a number of local and international Web sites. In October 2010, a ban on YouTube was lifted, but a range of IP addresses used by Google remained blocked, thus access to Google Apps hosted sites, including all Google App Engine powered sites and some of the Google services, remained blocked. All Internet traffic passes through Turk Telecom's infrastructure, allowing centralized control over online content and facilitating the implementation of shutdown decisions. Many minor and major websites in Turkey are subject to censorship.