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When your audience answers with their comments you have sprouted a blog conversation.
Every comment left, creates opportunities for others in your audience to speak their mind. They now can agree with you or take the side of a commentor or state their own novel idea on the subject being discussed.
People can argue with other commentors, like comments or try to turn the conversation in a new direction.
When things are slowing down you, as moderator, can add your two cents to try to get more comments coming in...
Comment with another good question and a whole slew of more comments might start rolling in.
On LinkedIn!