Open Graph is a protocol that is used to integrate any web page into the social graph.
OpenResty is a web platform based on nginx which can run Lua scripts using its LuaJIT engine.
PHP is a general-purpose scripting language used for web development.
Priority Hints exposes a mechanism for developers to signal a relative priority for browsers to consider when fetching resources.
Webnode is a drag-and-drop online website builder.
YouTube is a video sharing service where users can create their own profile, upload videos, watch, like and comment on other videos.