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Valleywag's favorite dancer, Mark Cuban, is sashaying to enter the crowded market of Facebook applications with Radical Buy. Radical Buy is not radically different from other venues for selling goods, like eBay or Facebook's own Marketplace. Cuban's approach is distinguished in one significant way: The application introduces commissions to those who display other people's listings and help close sales. By providing even nonsellers with a chance to make money, Radical Buy hopes to get uptake beyond a small audience of Cuban followers.

Not that Cuban is passing up the chance to sign up his superfans. The Dallas Mavericks owner will list some of his own '90s bubble-era tech-company posters, as well as memorabilia from his sports team, appealing to his two core audiences of supporters, which should guarantee Radical Buy a slightly better chance of succeeding than Cuban had of winning Dancing with the Stars.