My latest digital vision is Giiiggle, a social network. Giiiggle’s smartphone app creates bubbly laughs. Its search engine puts joyous results first. It mines postings to find smileys, autoedits entries to remove gloom and negativity, and rates people by their laughter quotient. In a troubled world, Giiiggle will get big everywhere fast. You know it’s good because it’s being created in a dorm room. If you want to invest, I’ll scribble some numbers on the back of an envelope…

A version of this article appeared in the July–August 2011 issue of Harvard Business Review.