A few generations ago, college students showed their romantic commitments by exchanging special objects: rings, pins, varsity letter jackets. Pins and rings were handy, telling everyone in local communities that you were spoken for, and when you broke up, the absence of a ring let everyone know you were available again. Is being Facebook official really more complicated, or are status updates just a new version of these old tokens?

Many people are now fascinated by how new media has affected the intricacies of relationships and their dissolution. People often talk about Facebook and...