Reddit decides to go open source. Reddit is already using open source software – Debian, lighttpd, HAProxy, PostgreSQL, Slony-I, various python libraries, Psychopg, pylons, Solr, Tomcat, Ganglia, Mercurial, Git, gettext (translation), daemontools, and memcached. The only thing that isn’t open source is Reddit itself so they decide to open source it.
(Souce: Reddit)
Oh so that’s what the penguin is about.