WhatsApp had over 2 million users connected to their (Erlang) server last year. http://blog.whatsapp.com/index.php/2012/01/1-million-is-so-2011/ http://blog.wh

WhatsApp had over 2 million users connected to their (Erlang) server last year. http://blog.whatsapp.com/index.php/2012/01/1-million-is-so-2011/ http://blog.whatsapp.com/index.php/2012/01/1-million-is-so-2... Here is the same in Erlang for reference (from a few years ago, I would be interested to see if there is a more efficient way now): http://www.metabrew.com/article/a-million-user-comet-application-with-mochiweb-part-3 http://www.metabrew.com/article/a-million-user-comet-applica...