Call and response spam is a sleazy trick to get advertisements or links for free on this site.
Let's say I am trying to get people to come to my flowery hat site. I set up two fake accounts, let's say named "questioner" and "hatexpert".
I will use my fake "questioner" account to say "Hello friends, I have a flower party to go to any would really like to know were I could get a flowery hat".
Then after a couple of hours I will use my "hatexpert" account to provide a "helpful" answer to my own question "Max's hats at www.maxshats.com
has a very nice selection of flowery hats. I have bought serveral of them and have found them to be of the highest quality and style".
It's a pretty transparent trick, I am lauding my own product using a fake conversation. People around here don't look very kindly at this type of activity.