The Internet already swirls with millions of images created by consumers using digital cameras. And by the end of 2004, some 180 million cell phones worldwide will have cameras built in, according to InfoTrends/CAP Ventures, an analysis firm in Weymouth, MA. So it's not surprising that one of the fastest-growing Internet applications is online photo sharing: the creation of individual or group Web albums where people can upload digital snapshots and invite friends to view and comment on them or order prints.

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