The latest addition to the Joomla website is People. This is a social site with features similar to Facebook. Here you can mix with other Joomla people to learn more, make friends and simply experience the enormous size of the Joomla community. I encourage you to register and when you have logged in, head over to my profile and add me as a friend.
Even if you're not interested, you might like have a look at how the site works. It is a tremendous example of the complexity you can achieve with a Joomla site. The platform is powered by a social networking extension called JomSocial.