Ok. To me, there are no "social networks". There is the open web, where Google (not search.twitter.com) is the tool we use to find stuff, and then there's the c

Ok. To me, there are no "social networks". There is the open web, where Google (not search.twitter.com) is the tool we use to find stuff, and then there's the closed web, Facebook. I am puzzled - to say the least - about Twitter. I'm trying to understand how big - and important, more than big, really - it really is vs. how over-hyped, how over-valued etc. Hope this can help you help me. Thanks :)