Fashion designers who want to make a splash on Twitter are often delegating the chore of maintaining a personality and presence to communications personnel. Erika Bearman, @OscarPRGirl on Twitter, is the director of communications for fashion house Oscar de la Renta, and she has amassed a Twitter following of more than 14,000 who tune in to news about the designer and to get the dish on the world of fashion. Some popular fashion houses have popular but anonymous Twitter feeds -- including @DKNY and @DieselUSA.