I don't agree with this view of flow. Flow is a form of intrinsic motivation, characterized bySpeaking psychologically, the real need people have here is to smoothly predict their worlds. Being able to anticipate, and thus control your world, removes stress and anxiety, promotes feelings of reward and contentment. This has been called "flow experience". It is why people enjoy sports, music and other kinds of skilled action so much. We can get into something and just do it.
People also experience flow in their social worlds - when all is predictable and controllable.
complete immersion, no self-evaluation, perfect control without conscious effort to be in control - when automaticites match any behavioral demand. In many ways a flow state is a deindividuation of self.
Social situations in the world at large, even if they are predictable and controllable, do not meet the criteria IMO. You may feel better if you think you are in control, and if you think you can predict, but it's a far cry from flow.