In the past, the first human touch by writing to hand, then use courier pigeons. Photos of the dove is seen as employees take full responsibility letter. Then move letter by mail. Modern communications over the telephone table, typewriter, fax machine. Today, a few people still write letters mailed or hand landline. However, developing information technology, the Internet is widely available, the vast majority of mobile phone users, e-mail, social networking sites to keep in touch with each other
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