There was a time when all the remembering that had to be done, was our own responsibility. But then came the day and age of big corporations with thousands of employees, and you were made a manager. As if it was not enough that you had to keep in mind a hundred and one things, now you have to remind other people as well? And what do you do if your own memory decides to fail you? Being an absent-minded professor is fine if you are slated to win the Nobel Prize or something, but not otherwise.
Most often memory loss is associated with old age and senility or carelessness and irresponsibility (the latter the trademarks of youth) or amnesia or lunacy. Does that sound at all familiar? On a small scale, sticking post-its on the refrigerator door does have good results. The fridge works like a notice board, and if it is utilized properly, there will be no need to remind family members in any other way.
However, both, the fridge pretending to be a notice board, and the real notice board itself suffer from the same disadvantage — what if nobody reads the notes placed on them? Is that why the SMS emerged? To send those very notes to individual people in such a way...