The XRumer autosubmitter includes a "Question-answer" system. It can help to create a complete virtual dialog for effective promotion of your site.
It's essense is simple: firstly it posts questions such as "Does anyone know a site about aquarium fishes?" After that the system switches to answer mode and can post answers into these same topics, for example something like "I know a site that fits your needs perfectly, visit: http://your_site.com".
Of course, the answers are sent from a different IP and from a different user name.
Answers can posted second and third times, creating whole virtual dialogs and attracting quality auditorium to your site.
In the documentation to the software a more detailed explanation and description of the process is included.