To add to this, not only is it a simpler problem, but they stood on the shoulders of giants that already solved it. They used ejabberd, a full-featured xmpp ser

To add to this, not only is it a simpler problem, but they stood on the shoulders of giants that already solved it. They used ejabberd, a full-featured xmpp server written in Erlang. Imagine half your job already done for you. Granted, they heavily customized it by this point, but they did a great job picking the right off the shelf solution to begin with.