DENVER • Santa's piling up more than presents this year. The big man's trackers at NORAD say Santa Claus also broke records this Christmas Eve.

Volunteers at Peterson Air Force Base in Colorado were fielding 8,000 calls an hour Saturday afternoon, on pace to break a record. Also, Santa's NORAD Facebook page approached 920,000 "likes" by midafternoon. Last year, Santa had 716,000 "likes."

Volunteers at NORAD Tracks Santa said children started calling at 4 a.m. Saturday to find out where Santa was.

The North American Aerospace Defense Command has been telling anxious children about Santa's whereabouts every year since 1955. That was the year a Colorado Springs newspaper ad invited children to call Santa on a hot line, but the number had a typo, and dozens of children wound up talking to the Continental Aerospace Defense Command, NORAD's predecessor.

The officers on duty played along and began sharing reports on Santa's progress. It's now a deep-rooted tradition at NORAD, a joint U.S.-Canada command that monitors the North American skies and seas from a control center at Peterson.

NORAD's Santa updates are blowing up on social media, too. In addition to the website and Facebook and Twitter pages, Santa this year has a new tracking app for smartphones. The app includes the Elf Toss, a game similar to Angry Birds.

Michelle Obama was among the volunteers for a second year in a row. She took about 10 calls from her family's vacation in Hawaii.