Have you created alternate accounts to post questionable responses?
tokenadult: No, never. On most online communities I use my real name. On one very useful online community, the community rule is that no one uses a real name, so I came up with my current screen name. As I join other communities where the use of a screen name is the norm, I use the SAME screen name, so that people can tell who I am. I let my reputation build from the content and appropriateness of what I post. So far HN and Newmogul are the only sites I am active on with an explicit karma system, but on two other sites where I use this screen name I have been tapped to be a moderator by the forum owners, because they recognize how I interact with the community. Anyone can do this.