I find it hilarious that some people here say that :
+ they think Twitter will fail
+ they also admit they don't understand how it works
That's some serious opinion.
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Some people like Twitter. Some people love Twitter. Some people prefer Twitter. You may disagree. You may have a hard time understanding how it works. You may have a hard time monetizing it. That doesn't mean it'll fail.
I work with Twitter and I don't care if it'll still be here in 5 years. If it fails, it'll be a big disappointment but I'll adapt and move elsewhere. Meanwhile, I find it way more interesting than Facebook. And I'm not even following celebrities.