Behind the smoked glass of a nondescript building in central Paris young people in open-necked shirts interact with Twitter and other social-media networks. This has the feel of a start-up, but in fact it is an outpost of bnp Paribas, one of France's biggest banks. Hello Bank!, with its catchy name and irritating punctuation, represents one of the most voguish trends in banking. It is trying to entice customers to abandon expensive bank branches and do most if not all of their banking on their mobile phones and tablets.
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