(Mashable) —Howard Greenstein is a Social Media Strategy and Marketing consultant, and President of the Harbrooke Group. He’s also a national board member of Social Media Club. We’ve all experienced that person who’s talking on his cell phone in public, in a voice that’s way too loud — on the train, in a restaurant, or walking down the street, screaming into the mobile, oblivious to the effect he’s having on the crowd nearby.
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