The bonds of friendship are central to the human experience. Friends help us as we grow through childhood, weather the storms of adolescence and explore the larger world beyond. But when do people shift focus from the quality of friendships to their quantity? This week, we welcome Michael Duffy to explore the phenomenon of quantifying friendship. How does it diminish our appreciation for the quiet and subtle moments between friends? How might a quantitative perspective alter our approaches to new friends? What societal and cultural institutions encourage an attitude of quantifying friendship?