cdnjs is a free distributed JS library delivery service.
DoubleClick for Publishers (DFP) is a hosted ad serving platform that streamlines your ad management.
Facebook pixel is an analytics tool that allows you to measure the effectiveness of your advertising.
Google Publisher Tag (GPT) is an ad tagging library for Google Ad Manager which is used to dynamically build ad requests.
Modernizr is a JavaScript library that detects the features available in a user's browser.
Open Graph is a protocol that is used to integrate any web page into the social graph.
ShareThis provides free engagement and growth tools (e.g., share buttons, follow buttons, and reaction buttons) for site owners.
Twitter is a 'microblogging' system that allows you to send and receive short posts called tweets.