Question: Are Social Networking Sites....Working?

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I can't help but notice that there are alot of social networking sites that have cropped up within the past year. The top ones are Myspace, YouTube, DirectMatches, etc. Now I've noticed Sales Spider, Notarysource and others. What I would really like to know is, are these social sites actually being social? Meaning, are people actually making life-long friends, acquaintences, business partners, dates, and travel buddys'? Please comment if you have something to share. I would love to hear from you.