EX.CO (formerly Playbuzz) is an online publishing platform for publishers, brand agencies, and individual content creators to create content in interactive formats such as polls, quizzes, lists, video snippets, slideshows, and countdowns.
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.
VK is a Russian online social media and social networking service.