"Alex should just shut the f--- up. That's it."-- Brian Cashman responding to reports ofAlex Rodriguez Tweeting about his progress.For anyone who lives under a rock, the big news on Twitter this week is that Alex Rodriguez now Tweets. He has a Twitter handle of @AROD. Creative right? Anyway, the way the story goes is, Alex has been tweeting his progress. We all know he's rehabbing and probably chomping at the bit to get back to the Yankees. The bottom line is, he's anxious, I get that. But you know who doesn't? Brian Cashman.Earlier today, ARod wrote this:Visit from Dr. Kelly over the weekend, who gave me the best news - the green light to play games again! http://t.co/RuzfXOJjHI— Alex Rodriguez (@AROD) June 25, 2013Exciting right? Well Cashman got wind of it today and clearly wasn't...

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