He sees you when you're sleeping, he knows when you're awake, and he knows how many followers you have on Twitter.
Not long ago, you could tell Santa Claus what you wanted by either sitting on his lap or writing a letter.
But now, he's is available by text or e-mail, Twitter or Facebook. Kids can watch his worldwide journey online or take a phone call.
One project called Portable North Pole sends kids personalized videos from Santa - even those who deserve a lump of coal.
And the trend has meant that some major post offices are handling far less mail directed to him. Chicago has handled about 10,000 letters to Santa this year, down from 15,000 to 20,000 in 2009.