I know that I said adults can be on Facebook yesterday… but there is something that you have to understand about privacy.
To a limited extent, individuals are the masters of their own privacy on social networking sites like Facebook. That means that when you friend someone you need to understand that they might not want you seeing their profile. Especially if you are more developed in the years and the person you are friending is a high school student, college student, or a relative. This is further compounded if you did something like change the attempted friend’s diaper when they were a baby.
It’s probably not personal. They just don’t want you seeing pictures of them doing keg-stands or the dumb crap their friends write on their “wall.”
Don’t cry about it and try again when they are out of college.