Fastly is a cloud computing services provider. Fastly's cloud platform provides a content delivery network, Internet security services, load balancing, and video & streaming services.
GitHub Pages is a static site hosting service.
A very simple search index.
Open Graph is a protocol that is used to integrate any web page into the social graph.
Retype is an open-source static site generator built with Node.js that allows users to create and manage websites with ease using Markdown as the primary content format.
Varnish is a reverse caching proxy.
YouTube is a video sharing service where users can create their own profile, upload videos, watch, like and comment on other videos.