Division of Health Promotion and Behavioral Science School of Public Health San Diego State University San Diego CA USA;
Department of Geography San Diego State University San Diego CA USA;
Department of Psychology San Diego State University San Diego CA USA;
Department of Applied Health Science School of Public Health Indiana University Bloomington Bloomington IN USA;
Department of Applied Health Science School of Public Health Indiana University Bloomington Bloomington IN USA;
Papillomavirus Vaccines; Twitter Messaging; Social Media; Information Dissemination; Twitter;