Who can see stories about my comments and likes in News Feed and ticker?
People included in the audience of the post can see your comment or like in News Feed or ticker as well as other places around Facebook. You can check who something is shared with by going to the post and hovering over the audience icon.
For example, you might comment on a photo one of your family members posts to just family. A friend of yours, who isn't included in the audience the photo was shared with, won't see a story in ticker or News Feed about your comment.