Automattic Inc, the company that developed the Wordpress blogging software, has announced the acquisition of Colorado based commenting system Intense Debate. The amount involved was not declared either by Intense Debate CEO Tom Keller or Toni Schneider, Automattic boss. Intense Debate has said that it will be going back to an invite only system in the immediate future until the integration is complete. The announcement was made on Tuesday (Techstars demo day at Mountain View, California).