StarCraft 2: Heart of the Swarm will introduce Groups system
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Following on from clan support, StarCraft 2: Heart of the Swarm will add a Groups system to the Battle.net RTS. In a new developer post, Blizzard explained the Groups have many similar features to Clans including chat channels, a news page and roster. The crucial difference is that Clans can only have 20 members, while Groups support a "nearly unlimited number". Players can join just one Clan, but up to 20 Groups; Groups can be public and do not have a tag. More details through the link above. Groups will be addedin an upcoming beta patch and will go live alongside Heart of the Swarm in the first half of 2013.
Thanks, Polygon.