Perhaps with older people the internet is used because other means of communicating can be more difficult - it is a means to an end rather than an end in itself. And also generally for older people it is more about exchanging thoughts, ideas and opinions than about self-promotion.
Looking at younger people, however, I agree with a lot of what was said. It's as if these young people are, to some extent, living their lives through Facebook and other social networks. It's almost as if they are competing with one another to produce the most interesting and exciting profile, rather than making real, sincere friendships with people.