[notduncansmith]

It absolutely is. If you're interested in why, I recommend Nir Eyal's (great) book, Hooked: How to Build Habit-Forming Products. Basically, our brain gets addicted to "variable reward systems" (Facebook, slot machines, news websites) because it gets excited when it finds something interesting/entertaining. Not everything is though (this is the key part), so when you finally do find something good your brain gives you a dopamine rush, which addicts you. I won't pretend that I don't struggle with this addiction myself, but I've found having genuinely interesting work really helps - I read HN at work quite rarely at my new job.