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I actually like Facebook for things like "happy birthday", it's easier then sending one of those e-Cards.
 
The difference between MySpace is Facebook has a strong adult use. Parents are using it as well as kids, families and even 60+. The adult market use it which will help in longevity but the interactive side with games, etc may not be engaged as much. Personally, I hope FB dies and iMessage takes over - communication without ads to people you actually speak to.
 
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