— HOW IT STARTED: A December 1955 newspaper ad invited kids to call Santa, but the phone number it listed was for the Continental Aerospace Defense Command, the predecessor to the North American Aerospace Defense Command. The officers on duty played along and began passing along reports on Santa's progress.
— HOW IT WORKS: Kids call 877-HI-NORAD or email firstname.lastname@example.org starting at 4 a.m. MST on Christmas Eve. A volunteer checks a big-screen computer monitor and passes along Santa's location. Updates are posted at noradsanta.org, facebook.com/noradsanta and twitter.com/NoradSanta. Hundreds of volunteers work for 23 hours on the day — and the night — before Christmas.
— SO FAR THIS YEAR: NORAD Tracks Santa had 1.5 million Facebook likes as of Wednesday morning. Twitter followers stood at around 143,000. Initial website visits weren't available.
— AND LAST YEAR: The website attracted more than 19.5 million unique visitors in December, the Facebook page drew 1.45 million "likes" and the Twitter feed had 146,000 followers. Volunteers took 117,000 phone calls and answered 9,600 emails. Another 800 inquiries came in via OnStar. The Facebook likes, Twitter followers, phone calls and OnStar questions were all record highs for NORAD Tracks Santa.
— GROWING FAST: Visits to the website, which was launched in 1997, peaked at 22.3 million in 2012 before dropping to about 19.6 million last year. The reason isn't clear, but Maj. Beth Castro, a NORAD spokeswoman, said the website might not have been able to accommodate all the traffic.
— PHONE CALLS: Phone calls rose from about 74,000 in 2009 to more than 117,000 in 2013.
— NEW THIS YEAR: The website has an animated elf named Radar. "Radar" was the favorite in a vote on Facebook, beating out "DARON," which is NORAD spelled backward, and "Echo L. Foxtrot," which uses the military phonetic alphabet to spell out "elf." NORAD Tracks Santa also has a new mobile version of its website for smartphones.
— WHAT'S NORAD? The joint U.S.-Canada command is responsible for defending the skies and monitoring the sea approaches for both nations. Its control room was originally inside Cheyenne Mountain in Colorado Springs in a shelter designed to withstand a nuclear attack. The control room is now at Peterson Air Force Base, also in Colorado Springs.