The demonstrations included camping in the middle of the plaza (@acampadasol), which began on 15 May 2011 amidst the election campaign for city halls and Autonomous Communities governments and which was fueled by social media, particularly Twitter and Facebook. The demonstrations then spread to more than sixty other cities throughout Spain. Since 12 June 2011, the square has held a free-standing domed structure made from pallets, which served as an information point for the 15-M Movement.