BATTLE BANNER TEASERS
Three teasers launched on Twitter that encourage fans to pledge their allegiance to one of the three main houses. And having done so they're rewarded by being sent a spot dedicated to their chosen house. Thus when Stark fans tweet @GameOfThrones using #HouseStark, Lannister fans tweet using #HouseLannister or Targaryen fans tweet using #HouseTargaryen they're sent one of the spots below.