Los Angeles-based Ranker, the online service which allows anyone to list and rank things on any topic, said today that it has named Mani Dhillon as Chief Operating Officer, and tapped former MySpace CEO Michael Jones for its board. The company, headed by Clark Benson, said that Dhillon was most recently the GM of Urbanspoon, and has also served at EA Mobile and Cisco. Jones, who is CEO of Santa Monica-based Science, was formerly CEO of MySpace, and also founded Tsavo Media and Userplane. Ranker said it is now getting around 4.5 million monthly unique visitors. Ranker is venture backed by Draper Associates, Rincon Venture Partners, Siemer Ventures, Pasadena Angels, and the Tech Coast Angels.