My research revolves around three interconnected topics: causality, social networks and communication. Methodologically, I adopt laboratory and field experiments to draw powerful causal inferences. With randomized control trials, I observe how different incentives and institutions influence individual decisions and shape the network topology. The most intriguing application, to me, involves communication. Whom do I connect to in a communication network? Should I choose to tell (or hide) the truth to those who are connected to me? What happens when individual choices like the above are aggregated to form the communication network? Those questions are at the core of my current inquiry.