LiveJournal.com, a website and online community built around personal journals, was created by young computer science major Brad Fitzpatrick in March 1999. A database-driven method he'd been using to update his own journal since 1998 became a Web-based application that his friends could use, too. It was an immediate success, and soon became a bigger website than a single person could easily handle.
As a result, a small paid staff and a team of volunteers working with LiveJournal's creator has transformed LiveJournal into a Webby Award-winning site with over 3 million accounts, used by people worldwide. Today, LiveJournal still relies heavily on volunteer efforts (http://www.livejournal.com/site/contributors.bml) but also has an increasing number of dedicated permanent staff (http://www.livejournal.com/press/staff.bml). At any time, several people might be working on modifications and new features.
The site is now an open source software development project funded entirely by its members. This means that anyone can use the same software that powers the site and that anyone can suggest improvements. It has been expanded to allow easy creation of journals, weblogs, and even interest-based online communities.
If you are interested in volunteering with LiveJournal, http://www.livejournal.com/support/faqbrowse.bml?faqid=57 lists several ways you can help out.