アメックス、「つぶやき」で値引きの新サービス – 日本経済新聞
アメックス、「つぶやき」で値引きの新サービス 日本経済新聞 【ニューヨーク＝蔭山道子】米クレジットカード大手アメリカン・エキスプレス（アメックス）は米顧客向けに、ミニブログ「ツイッター」と連動した新サービスを始めた。カード利用者が特定の値引きサービスを識別するためのキーワードをつぶやくと、店頭でのカード決済時 ... |
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