In the last few months I’ve become a fan of the TCS stack exchange, a question-and-answer forum for theoretical computer science. Some of this activity is in AGT. I certainly sometimes feel that this is yet another time sink to be found on the Internet (like writing a blog…) , allowing me to keep away from “real work”. However on the whole, I would evaluate my time spent there as productive. On the question side, this a good place to check out whether someone knows an answer to some small obstacle that got you stuck in your research, or to check a point of view when looking at a new subject, or finding a reference, etc. I also feel that the “answer side” is beneficial for me: questions that I’m able to answer often look at something that I know from a different perspective — a perspective that it’s good to gain. In other cases, I look at a question, think that I should know the answer and, when thinking about it a few more minutes, realize that there is a gap in my knowledge — one that I didn’t realize existed. In such cases, it sometimes means that I get to fill this gap, or sometimes that I find a real “hole” worthy of research. A recent question asked about efficiency gaps between correlated equilibria and coarse equilibria. The fact that I wasn’t able to answer it, demonstrated to me that I don’t understand coarse equilibria well enough. When someone finally answers the question (as I’m quite sure will happen — this can’t be hard…), I will learn something.