Emotional Self-Disclosure in Online Breast Cancer Support Groups: Examining Theme, Reciprocity, and Linguistic Style Matching. 
The present study investigated emotional self-disclosure (ESD) patterns and their effects in online support groups specific to different stages of breast cancer.  Linguistic features of messages posted to an online breast cancer support group were analyzed.  ESD was common, and was consistent across four stage forums.  Emotional talk was linked to a variety of themes, but most prominently in the context of discussions about social connections rather than health or death.  Linguistic style matching mediated the relationship between ESD in posts and reciprocal ESD in comments, suggesting a key role for mutual understanding and engagement between posters and commenters.  Implications for health communication theory and practice were discussed.