I know many of us have a bias toward BBSes, but for those of you who use social   
   networking sites online, why do you suppose people tend to gravitate toward one   
   particular social networking site?  For instance, Facebook seems to be what   
   everyone uses, even though there are alternatives such as Google+, Orkut,   
   MySpace, and others (interestingly, Orkut was very popular in Brazil).  I   
   mainly use social networking sites just to keep in touch with people, and   
   Facebook is really the only one I use these days, simply because that's what   
   most of my friends use.  But is that the only reason people tend to gravitate   
   toward one social network vs. another?   
      
   It seems to be the same with professional networking sites, too.  LinkedIn   
   seems to be the most popular one, even though there are others (such as Spoke   
   and Plaxo).   
      
   So I'm curious what you all think about why people tend to gravitate toward one   
   social networking site vs. the others.   
      
   Nightfox   
      
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