The purpose of this article is to analyse interaction in academic weblogs, focusing on discursive features that provide cues as to the participants' interpersonal behaviour. The data for this study consisted of postings and their corresponding comments taken from 11 academic weblogs. The analysis of the corpus allowed us to work out a framework of different categories of discursive indicators of social and antisocial behaviour. Following Rourke "et al." (1999), the indicators of social behaviour were categorized into the following types: (i) affectivity, (ii) cohesiveness, and (iii) interactivity. The indicators of antisocial behaviour were classified into three groups: (i) negative socioemotional behaviour, (ii) group exclusion, and (iii) confrontational interaction. The study shows that bloggers and weblog readers use a great variety of discursive strategies aimed at constructing and sustaining affective and solidarity relations in the community and creating an identity for themselves as competent members of the disciplinary community.