Prefix your topic with your intention so we are clear on what outcome you are striving from the discussion. Examples:
[inform] You are simply seeking to inform the group of this item. You may field clarifying questions from the group on your inform, but not seeking further discussion at this time.
[ideation] You are seeking divergent and wide perspectives from this group. In this brainstorming mode, all ideas are accepted, without critical analysis.
[analysis] You are asking the group to help you poke holes in your idea/topic/plan/etc.
[quest] You are seeking information/responses to a question you have.