I stumbled upon this paper in the course of my work and thought some might find it interesting.
http://www.thoughtcrumbs.com/publications/Burke_RhetoricalStrategies.pdf
http://www.thoughtcrumbs.com/publications/Burke_RhetoricalStrategies.pdf
Introductions and Requests: Rhetorical Strategies That Elicit Response in Online Communities
Unlike conversation in face-to-face groups, messages in online communities can be ignored or dismissed as illegitimate. There is a cost to reading and replying to messages, so posters must prove they deserve community effort. Thus, legitimacy is a critical issue in computer-mediated communication, where posters struggle not only to be heard, but also to appear worthy of the groups attention. Some messages are more likely than others to get a reply, and the difference is often in the wording.
....
Two prevalent strategies that affect reply are self-disclosing introductions and making requests. Introductions serve two key purposes: signaling legitimacy and signaling commitment. Introductions use appropriate in-group vocabulary, demonstrate personal expertise, and indirectly show the authors relationship to the group by showing his or her legitimate relationship to the topic around which the group organizes.
....
First person singular pronouns (i.e. I, me, my) increased the likelihood of reply: Every doubling of these pronouns in the message body increased likelihood by 8%.
...
Question marks in the message body and subject line each increased the likelihood of reply. Every doubling of question marks in the subject line increased reply rates by 3%, and every doubling of sentences ending in question marks in the message body increased reply rates by 5%.