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On Monday the professor posted this update: "Had a good day today, didn't want to kill even one student.:-) Now Friday was a different story ..." In another comment, on January 21, she wrote: "Does anyone know where I can find a very discrete hitman, it's been that kind of day."

a way of venting to family members and friends, who she mistakenly believed were the only ones who could view the postings.

Younger teenagers were not included in these studies, and they may not have the same privacy concerns. But anecdotal evidence suggests that many of them have not had enough experience to understand the downside to oversharing.

But in many cases, young adults are teaching one another about privacy.

Ms. Liu is not just policing her own behavior, but her sister’s, too. Ms. Liu sent a text message to her 17-year-old sibling warning her to take down a photo of a guy sitting on her sister’s lap. Why? Her sister wants to audition for “Glee” and Ms. Liu didn’t want the show’s producers to see it. Besides, what if her sister became a celebrity? “It conjures up an image where if you became famous anyone could pull up a picture and send it to TMZ,” Ms. Liu said. Andrew Klemperer, a 20-year-old at Georgetown University, said it was a classmate who warned him about the implications of the recent Facebook change — through a status update on (where else?) Facebook. Now he is more diligent in monitoring privacy settings and apt to warn others, too.