San Francisco’s Craigslist.com is being sued in Chicago for posting racist housing ads, it’s been the focus of law enforcement or media exposes for helping prostitutes find customers in Boston, Seattle and Long Island, N.Y. And today the Orange County Register reports that people are buying illegal fireworks through Craigslist. The paper reports that police arrested a 27-year-old Newport Beach man who posted a Craigslist ad for illegal fireworks. Unlike newspapers, who have ad takers who screen out inappropriate ads, Craigslist lets users post their ads automatically, and then volunteers are supposed to review the ads after their posted for their legality. Apparently, Craigslist’s system doesn’t always work.