Citibank credit cards are used more than any other for online shopping, according to a survey by Brittain Associates Inc.

More than customer acquisition, use levels have come to be viewed as the key indicator of a card issuer's success in generating online business, particularly given customers' tendency to rely on one card for all their online activities. Of the 55.4 million adults who shop online, 52% - or 28.8 million - use one card almost exclusively, according to Brittain Associates, an Atlanta-based research firm. Ten percent of Internet users do not use credit cards to shop online, and 38% said they use a variety of cards.

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