As explained in the Facebook announcement, and in Mr. Goel’s article, teenagers who choose “Public” in the audience selector will automatically get a reminder that by doing so, their post will be seen by anyone. The Facebook announcement and Mr. Goel’s article both have a screen shot mockup of what this reminder will look like. The screen shot mockup shows that teenagers will have the option to change the post’s privacy setting. The Facebook blog has a second screen shot mockup that shows the follow-up reminder that will come up if the teenager has chosen the “Public” setting. The follow-up reminder tells the teenage that picking “Public” means the post will be shared with people whom the teenager doesn’t know.
This is a significant change about which parents need to know — and which they will want to discuss with their teenagers who use Facebook. Teenagers might or might not fully understand what it means to have their posts published to a wide audience of people they don’t know — and people who might use the teen’s posts, or personal information, in ways the teen doesn’t like or want (either now or in the future).