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I don't "get" Twitter.
I don't really care what anyone is doing, and most Twitter entries I have seen are of the "Who gives a shit?" variety.
Twitter is popular though, and shows no signs of going away. To help us all better understand its benefits - here's an article about everyday uses in the real world.
Warning: Article contains the example twitter "Dude, Kathy Griffin is coming to Portland March 4th."