IDG Answers is a community of experts who are passionate about technology. Ask a question or answer one below.
I did a little looking around after seeing your question. Having been a Facebook user back in college, there are some old things that probably wouldn't do me any favors to revisit. It seems that this issue is not certain. As you noted, it was reported in a few French newspapers, but Facebook claims that it is basically a rare glitch that brings up your old wall posts from before Timeline and people are mistakenly thinking they are old private messages. The user response is basically, "My name might be Tucker, but it isn't Sucker," and that Facebook is BSing. While I'm rarely surprised at the stupid things people do, I would think even dim bulbs can tell the difference between an old wall post and a private message.