Why are people not sending out Christmas cards anymore?

My daughter asked me this question today and i am passing it on to you. Years ago, we use to receive 50 or 60 Christmas cards each year. Today, we are lucky to receive 5. Is this because of the increase in the cost of a stamp or has the computer taken over as the communication of choice, at Christmas? I really miss opening my mailbox and opening Christmas cards from my family and friends. Question: is sending and receiving Christmas cards just another thing of the past?