In the history of IT, there have been several major transitions in the use of computing, and each of these transitions has reshaped large sectors of human activity. At this time, computers are still of limited use and capability: although computationally powerful, they are not engaged in the "soft" aspects of our lives, such as our relationships, our emotional well-being, and our communities. We are now poised on the cusp of a new explosion in computer usage, built on the capabilities of computing systems to understand our emotional, personal, and daily lives, and to act meaningfully in them.