When I was visiting OnStar headquarters last month, the cutest factoid I heard was that OnStar tracks Santa Claus on Christmas Eve. (And I heard LOTS of cute factoids. Okay, lots of factoids: not necessarily cute ones. But this one is. For real.) I just received the details on this a couple of days ago and wanted to share it with you, so my Christmas-celebrating readers can do this. (This post is not sponsored: it’s just so CUTE I had to share!) OnStar is, for the fifth year, teaming up with the North American Aerospace Defense Command (NORAD). Each year, NORAD conducts a special mission on December 24 – following…