Google AdSense is a program run by Google through which website publishers serve advertisements that are targeted to the site content and audience.
Nginx is a web server that can also be used as a reverse proxy, load balancer, mail proxy and HTTP cache.
Open Graph is a protocol that is used to integrate any web page into the social graph.
Prototype is a JavaScript Framework that aims to ease development of web applications.
Twitter is a 'microblogging' system that allows you to send and receive short posts called tweets.