At 6:30 p.m. last Tuesday, Michelle Murrain showed up at a downtown Oakland, Calif., street corner to meet with 15 strangers who had organized themselves over Facebook. Many showed up with $20 bills.
Their mission was to descend on Marion & Rose's Workshop, a gifts boutique, to spend money.
Ms. Murrain and her compatriots are among hundreds of devotees of the "cash mob," a new social-networking-and-shopping movement aimed at increasing sales at selected small businesses.
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