This isn't just for Nenshi, but for Twitter in general: people need to stop viewing Twitter activity as a waste of time. It's a legitimate communications platform that produces engagement and transparency. People saying that he should stay off Twitter and fix the city might as well be saying to turn off his phone, or not answer emails, or whatever. At the end of the day it's another way to reach someone, so I'm glad to see Nenshi takes the time to be accessible (selectively or not).