The social-gifting Wrapp application crossed the million-user mark on the strength of the holiday period, when users were sending a million gifts a week. The secret to Wrapp's success is that it works and it's not a scam, writes Sarah Perez, but is rather a legitimate way for companies to offers sampling and trials at their expense in order to reach specific target demos. "Seventy-five percent of Wrapp's users are women, with an average age of 32 to 33," Perez writes.

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