I think it would be very useful for the Community platform to have the functionality built, following in the footsteps of FB and Instagram whereby, you are able to pin a comment and have it show as the 1st comment because it is pinned, regardless of when it was posted.
For example, we utilise competitions on our community attached to articles and when announcing the competition is closed it would be great if we could pin our comment to the top, instead of having to close the whole article as the article is usually a help and support or acquisition article, so the content is still relevant