Facebook pixel is an analytics tool that allows you to measure the effectiveness of your advertising.
Lightbox is small javascript library used to overlay images on top of the current page.
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.