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    <p>Facebook is using <a href="http://en.wikipedia.org/wiki/LAMP_(software_bundle)" rel="nofollow noreferrer">LAMP structure</a>. Facebook’s back-end services are written in a variety of different programming languages including C++, Java, Python, and Erlang and they are used according to requirement. With LAMP Facebook uses some technologies ,to support large number of requests, like</p> <ol> <li><p><a href="http://memcached.org" rel="nofollow noreferrer">Memcache</a> - It is a memory caching system that is used to speed up dynamic database-driven websites (like Facebook) by caching data and objects in RAM to reduce reading time. Memcache is Facebook’s primary form of caching and helps alleviate the database load. Having a caching system allows Facebook to be as fast as it is at recalling your data.</p></li> <li><p><a href="http://incubator.apache.org/thrift/" rel="nofollow noreferrer">Thrift (protocol)</a> - It is a lightweight remote procedure call framework for scalable cross-language services development. Thrift supports C++, PHP, Python, Perl, Java, Ruby, Erlang, and others.</p></li> <li><p><a href="http://incubator.apache.org/cassandra/" rel="nofollow noreferrer">Cassandra (database)</a> - It is a database management system designed to handle large amounts of data spread out across many servers.</p></li> <li><p><a href="http://developers.facebook.com/hiphop-php/" rel="nofollow noreferrer">HipHop for PHP</a> - It is a source code transformer for PHP script code and was created to save server resources. HipHop transforms PHP source code into optimized C++. After doing this, it uses g++ to compile it to machine code.</p></li> </ol> <p>If we go into more detail, then answer to this question go longer. We can understand more from following posts:</p> <ol> <li><a href="http://www.makeuseof.com/tag/facebook-work-nuts-bolts-technology-explained/" rel="nofollow noreferrer">How Does Facebook Work?</a> </li> <li><a href="http://20bits.com/article/data-management-facebook-style" rel="nofollow noreferrer">Data Management, Facebook-style</a></li> <li><a href="https://stackoverflow.com/questions/1009025/facebook-database-design">Facebook database design?</a></li> <li><a href="https://stackoverflow.com/questions/1309231/facebook-walls-database-structure">Facebook wall&#39;s database structure</a></li> <li><a href="https://stackoverflow.com/questions/7487476/facebook-like-data-structure">Facebook &quot;like&quot; data structure</a></li> </ol>
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