The name is Anders Behring Breivik. He is a rightwing christian conservative extremist who on his facebook page wrote frequent criticism about the "Islam-friendly" left-wing.

Having watched the Swedish right-wing nationalist party react to this have been very interesting. Yesterday they blamed Islam at once. Today they erased these posts.

Initially this seemed like the greatest propaganda that the nordic right-wing conservative parties could have hoped for, today it seems like the greatest blowback they faced yet.