Google Hosted Libraries is a stable, reliable, high-speed, globally available content distribution network for the most popular, open-source JavaScript libraries.
jQuery is a JavaScript library which is a free, open-source software designed to simplify HTML DOM tree traversal and manipulation, as well as event handling, CSS animation, and Ajax.
Open Graph is a protocol that is used to integrate any web page into the social graph.
Twitch is an American video live streaming service that focuses on video game live streaming, including broadcasts of esports competitions.
YouTube is a video sharing service where users can create their own profile, upload videos, watch, like and comment on other videos.