Emotion is a library designed for writing CSS styles with JavaScript.
HTTP Strict Transport Security (HSTS) informs browsers that the site should only be accessed using HTTPS.
Open Graph is a protocol that is used to integrate any web page into the social graph.
Wistia is designed exclusively to serve companies using video on their websites for marketing, support, and sales.
YouTube is a video sharing service where users can create their own profile, upload videos, watch, like and comment on other videos.