(Replay)Moderation vs. fanaticism in life pursuits,Social media as pleasure trap

In today's replay of episode 205, Dr. Lisle & Dr. Howk answer the following questions: 1. My brother never does anything in moderation, for example if he starts working out, he'll organize his life around it, stop all social drinking and the like. Then he will eventually feel empty and complain he's burnt out. My question is, is he destined to live in this open-unstable roller-coaster ride, or can I give him some advice (perhaps Harry Browne style) that will help him find his place? 2. I've heard Dr. Howk talk about social media as a potential pleasure trap, and I was wondering if she could go into more depth on that. What are the circuits being hijacked? What advice would you give to a low-key social media addict?