The idea behind clans - which is what they're called here - is to play games, usually tournaments, as a group, or to create levels as a group. To make it easier to find each other, they'd add tags to their names - usually something with ASCII, like Ж<pi><pi>Ж or //<sum> Sьз|<.
Since many of the people who form and join these clans are indescribable dolts, they invented 'clan wars', saying that it's a wargame after all. A clan war is where one clan plays against another, and nobody except the people in those two clans knows or cares about it. Usually there is much bragging by the winners of the little tournament, but since all their friends are in their clan... you get the point.
Then because people thought clans were stupid, they created 'groups', or whatever else Avara-politically-correct crud they wished. Usually these were identical to clans in every way, except that they more often did what clans are for in the first place, which is to play or create as a group.
Today, there aren't enough people to have any decent clans. There are a few fools who wander aimlessly through the Tracker, asking people if they want to join, usually mere seconds after they know that aforementioned people exist. What are you missing? Probably very little - as far as I know, there are no REAL clans left.
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