New media are having a significant impact on science communication, both on the way scientists communicate with peers and on the dissemination of science to the lay public. Science blogs, in particular, provide an open space for science communication, where a diverse audience (with different degrees of expertise) may have access to science…

This article offers a way of using the theory of audience design--how speakers position different audience groups as main addressees, overhearers, or bystanders--for written discourse. It focuses on main addressees, that is, those audience members who are expected to participate in and respond to a speaker's utterances. The text samples are…