Paperless Post, which is in New York, is a venture of Alexa Hirschfeld, 25, and her brother James, 23. It enables users to design, send and track e-vites and other social summonses on the Web while maintaining easy correctness and a life's-a-party air reminiscent of old-fashioned mailings. The siblings have handled 60,000 invitations since January, and 150,000 since their membership-based operations began last fall.
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