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Facebook is a social utility that helps over 900 million people around the world communicate more efficiently with their friends, family and coworkers. The site has been built on common open source software such as Linux, Apache, MySQL and PHP, and over the past few years the company has developed a number of open source infrastructure technologies to support the website's growth including HipHop for PHP, Cassandra, Hive, Scribe and Thrift. Facebook engineers actively contribute and participate in various open source projects, especially around the Apache Hadoop ecosystem, developing technologies that facilitate the sharing of information through the social graph.