CLEVELAND, Ohio - Flash mobs have been blamed as a factor in looting during urban riots. But now a group of online activists is harnessing social media like Twitter and Facebook to get consumers to spend at locally owned stores in cities around the world in so-called Cash Mobs.

At the first International Cash Mob day on Saturday, wallet- toting activists gathered in as many as 200 mobs in the United States and Europe, with the aim of spending at least $20 a piece in locally owned businesses, according to the concept's founder, Cleveland lawyer Andrew Samtoy.