If you have a Wordpress account, you should log in and just browse around the web a bit, looking for the black WordPress header at the top of pages. The reach of open-source can be truly incredible. It’s insane how often you see it when browsing, on sites that look nothing like WordPress installs at all. It also shows why it is such a common target and attack vector for hackers; find a zero-day exploit in WordPress and you compromise the security of a quarter of the web.