On Jan. 1, legions of Japan Post Co. employees delivered millions of nengajō (New Year's cards) to homes nationwide.

Over the next few days, employees at the postal company will sort through many more as they deal with a second wave of belated New Year's cards in the post that have been sent by residents feeling pangs of guilt after receiving a greeting from someone who is not on their mailing list.

With more and more people communicating via social media, however, one has to wonder how much longer this annual New Year's tradition will continue.