Irvine-based WebVisible has snagged former NetZero co-founder Ronald Burr as its Chief Operating Officer, the firm said Wednesday. The firm, which helps small businesses place local online advertising, said that Burr will oversee the firm's product development, engineering, IT, media, and operations. Burr helped found NetZero, and was most recently Chief Product Officer at Los Angeles-based legal information and education firm LRN.