It used to be that people sent cards at the holidays as a matter of social norm. Now with social media, most people don't send holiday greetings. After all, it is much easier to click a few times or to post once and let others see it when they may.
I view social media like a book - you don't know what it contains unless you actually make the effort to open it and read it. Since the point of holiday greetings is to let people know you are thinking of them, I think the social media model is not the right one for the purpose. Does a general "I'm thinking of all you people at this time" really happen? Do you even really know everyone on your friends list?
At the same time, sending holiday greetings to everyone you know might not be the best approach either. Do you really need to reach out to the person you met at a conference and struck up a conversation with? The one who you dutifully followed on social media, but have heard nothing from since? Not all holiday communication have the same worth and value.
So let's look at how to manage holiday greetings in the 21st century.