" With the persistence of data, there is, too, the persistence of people. If you friend someone as a ten-year-old, it takes positive action to unfriend that person. In principle, everyone wants to stay in touch with the people they grew up with but social networking makes the idea of " people from one's past" close to an anachronism. Corbin reaches for a way to express his discomfort. he says " For the first time, people will stay your friends. It makes it harder to let go of your life and move on." Sanjay, sixteen, who wonders if he will be " writing on my friends' walls when I'm a grown-up," sums up his misgivings: " For the first time people can stay in touch with people all of their lives. But it used to be good that people could leave their high school friends behind and take on new identities. "