This is a new paper, published a couple of weeks ago. (Sorry if it's been
mentioned before, I couldn't see a related thread.)
http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0104880
Principal findings:
We find that administrators maintain a rather neutral, impersonal tone,
while regular editors are more emotional and relationship-oriented, that
is, they use language to form and maintain connections to other editors. *A
persistent gender difference is that female contributors communicate in a
manner that promotes social affiliation and emotional connection more than
male editors, irrespective of their status in the community. Female regular
editors are the most relationship-oriented, whereas male administrators are
the least relationship-focused.* Finally, emotional and linguistic
homophily is prevalent: editors tend to interact with other editors having
similar emotional styles (e.g., editors expressing more anger connect more
with one another).