Comments let you ask an idea’s authors a question, share your experience or suggest how to improve it. Everyone who can see the idea can read its comments, and its authors are notified of new ones. Some challenges turn comments off; their ideas have no Comments section.

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   Open the idea and scroll down to Comments. Click into Write a comment… and type your comment.

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   Click Post comment. Comment posted confirms it, and your comment appears at the top of the list.

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   To reply to someone, click Reply under their comment, write your reply and click Reply next to it. Your reply appears under their comment.

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   To react to a comment, click the smiley face with the + under it and pick an emoji. Its count shows how many people reacted with it.

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To mention a colleague, type @ followed by their name and pick them from the list. They’re notified, as long as they can see the idea.

Commenting also makes you follow the idea and its challenge, so you hear about replies and updates. To remove one of your own comments, click Delete under it and confirm. Deleted comments can’t be restored.