clearly mr. Dvorak doesn't UNDERSTAND what a social networking website is, or what it's for. Yes some people join and "befriend" everyone in the known universe. usually those people are around 14-21, I know that's what I did on myspace until I realized I had 50 "friends" but didn't know most of them.
I've since ditched Myspace (no syndication for blogs) and took up with Facebook. The people on my face book aren't strangers, far from it, actually. With very few exceptions (maybe a handful) they are people I've actually met in real life. The majority are people from college, various coworkers and bosses from old jobs, a few guys I dated(or almost dated), people from my theatre company, high school friends, and then just regular friends and family members. All in all, 107 people, all of whom I actually know. All but 2 of them I've actually met in real life.