Yes, certainly, because it would seem to me pretty surprising that you did an investigation and didn't find this. I had adults tell me they were called by their friends, who said “You better get on your timeline, because right in your timeline are private messages that you and I sent to each other as private messages. Now they're appearing on a public face.” It seems to me that would be a major data breach.
I'm glad you tell me that it didn't happen, but when people tell me to my face that it did happen to them, and that they had to go back and find those private messages and remove them, it seems to me that the private message line isn't that secure and there needs to be a discussion about this.