It refers to a video or an article that was seen and shared enthusiastically by a very large number of people in a short time.

Jewish grandmother Judith Cohen went “viral” with short videos promoting an app that unconventionally reminds her grandchildren to call her regularly, or to wear a jacket. You know, grandmother stuff.

Of course, these apps do not really exist, and even the authenticlooking grandma is an actress. But, as silly as the videos are, it is actually the kind of app nearly all grandmothers would recommend. That’s what the Friends of the Hebrew University of Jerusalem thought when they shot this series of videos to promote the school.

The contrast between the likable, but technically unsophisticated granny, and the latest mobile apps is especially funny when Judith Cohen states, very grandmotherly, at the...