How to install WordPress with Nginx, MariaDB and HHVM on Debian 8

HHVM (Hip Hop Virtual Machine) is a just-in-time compiler developed by Facebook to run applications that are written in PHP and Hack language. HHVM is faster than the traditional PHP engine from ZEND and is used by Facebook to serve billions of web requests per day. This tutorial describes the installation of Nginx, MariaDB, HHVM and WordPress on Debian 8 (Jessie).