I’m always surprised at just how much time I can waste on Twitter and Hacker News. You know the story — It starts harmlessly enough as a quick scroll between tasks at work. Next thing you know, you’re in a marathon of reading, bookmarking, re-tweeting, and upvoting/ liking. Think about that. Social media has expertly cracked our mental stimulation code, leveraging instant gratification to keep us glued to the screen. It’s so effective that when we close the app and return to the real world, we immediately feel its absence.