Christmas is a great opportunity to contact people you have not had a reason to contact for a while.
Old friends, former colleagues, former clients, those who share an experience or passion and people you just like.
In this world of electronic communication, when you take the time, and make the effort to make that one to one human contact, it is always welcomed. Always.
We are so used to impersonal and mass communication that when one arrives that is personal, warm, and not asking for something other than a bit of your time to say Hi, we warm to it, and the person making it.
This is the human side of Christmas, what makes it worth while, irrespective of your beliefs.