A comment is a personal response to a record or blog post. The Comment control appears only if an administrator has enabled this feature. Comments can be hidden for records, but are visible to all users who can view a blog post.
When you view a record or blog post, you can work with comments in the following ways:
Enter a comment in the box, then click Post. If there is no comment box, use Social>Comment to comment on this item or respond to a previous comment. Note: You cannot edit or delete a comment after adding it. Only a moderator can delete comments.
When a record with a comment is displayed, the comment may be followed by text asking "Helpful?". If you found the comment helpful, click the link to help rank the comment for other users. The record will subsequently indicate the number of people who found the comment helpful.
Choose Social>Moderate (or click the Moderate Social Content button), then use the resulting screen to delete one or more existing comments, if your permissions allow.