Facebook pixel is an analytics tool that allows you to measure the effectiveness of your advertising.
Google PageSpeed is a family of tools designed to help websites performance optimisations.
jQuery PJAX is a plugin that uses AJAX and pushState.
Nginx is a web server that can also be used as a reverse proxy, load balancer, mail proxy and HTTP cache.
Open Graph is a protocol that is used to integrate any web page into the social graph.
PHP is a general-purpose scripting language used for web development.