To celebrate the summer season, popular Las Vegas hotel and casino, Excalibur, has just launched a social sweepstakes. The Facebook sweepstakes, live from June 18th to August 13th, 2012, gives participants the chance at winning a Las Vegas getaway for Liking Excalibur and entering their information. The grand prize getaway includes a three-night stay, entertainment, and more. Participants also have extra chances of winning for sharing the sweepstakes with their friends. If a friend wins, the participant that referred him or her wins too!