"Facebook connects its 500 million users using an array of open
source software to enable social networking as well as data
intelligence. Facebook's open source Web serving infrastructure has
a lot more than just the traditional LAMP (Linux/Apache/MySQL/PHP)
stack behind it.
"During a keynote session at the OSCON open source conference,
David Recordon, the senior open programs manager at Facebook,
detailed the infrastructure in use today at Facebook.
"At the language level of the stack, Recordan noted that
Facebook is using PHP by way of its own HipHop PHP runtime project.
Facebook officially announced HipHop earlier this year as a way to
speed up PHP operations, improve efficiency and decrease CPU
"At the database tier, Recordan said Facebook primarily stores
user data in the MySQL database. He said that Facebook runs
thousands of MySQL nodes, though he added that Facebook doesn't
care that MySQL is a relational database."