Not sure if everyone is aware but big-boards.com offers information about the biggest online forums. http://www.gaiaonline.com/ is the biggest (I'm sure many like me wouldn't recognize it even though it's the most famous one ever as it seems). It runs on: Funny enough, it uses phpbb. 762876204 posts 4503300 members
One of my own, which is also listed on Big Boards. Waaay smaller than Gaia online, though. Thank goodness.
Just think, if it ran on vbulletin, it would not need half those resources...LMAO Just Joking. That is a huge site.