Twitter isn't really an information app...it's a social networking app.  IMHO, expecting to really learn from it is like going to a frat party for help with your Trigonometry.  
Plus, there's only so much you can say in 140 characters.  Here on the forums, you can say a WHOLE lot more than that, and actually get relevant info.  The most you'll get there is...probably advertising, random nonsense comments, news, or politics ;)

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Knowledge is knowing a tomato is a fruit. Wisdom is not putting it into a fruit salad.