In this paper, we focus on a new aspect of the diffusion process that can help explain the virality of online new product campaigns. We propose that the sense of anonymity associated with being online liberates people from impression management concerns. This facilitates individuals to express themselves more freely at the individual level, in turn having a major accelerating on diffusion at the group level. We tested our hypothesis with a novel experimental paradigm as well as via an agent-based model (ABM). Participants in the experiment were tasked with coordinating on a product selection and confederates acted as a minority trying to spread the innovative product. The ABM mirrored the experimental game using an agent-level social payoff...