Mihaly Csikszentmihalyi — Hungarian Psychologist born on September 29, 1934,

Mihaly Csikszentmihalyi (Hungarian: Csíkszentmihályi Mihály, pronounced ( listen); born 29 September 1934) is a Hungarian psychologist. He created the psychological concept of flow, a highly focused mental state. He is the Distinguished Professor of Psychology and Management at Claremont Graduate University. He is the former head of the department of psychology at the University of Chicago and of the department of sociology and anthropology at Lake Forest College... (wikipedia)

A Web site that promotes flow is like a gourmet meal. You start off with the appetizers, move on to the salads and entrees, and build toward dessert. Unfortunately, most sites are built like a cafeteria. You pick whatever you want. That sounds good at first, but soon it doesn't matter what you choose to do. Everything is bland and the same.
Goals transform a random walk into a chase.
People enter Web sites hoping to be led somewhere, hoping for a payoff.
If we know what that set point is, we can predict fairly accurately when you will be in flow, and it will be when your challenges are higher than average and skills are higher than average.
Competition is an easy way to get into flow.