This study was designed to determine whether participation in an online social network intervention increases perceived social support for physical activity versus a minimal education control group by conducting a randomized controlled trial with 140 female undergraduate students. The investigators hypothesize that participants in the physical activity centered online social network intervention group will have greater increases in perceived social support for physical activity compared to minimal web based physical activity education controls.

Inclusion Criteria:

• female
• under the age of 25
• currently enrolled full time or part time student at the University of North Carolina at Chapel Hill
• classified as an undergraduate
• answers no to all questions on an exercise risk factor questionnaire (PAR-Q) or is cleared in writing by a physician to participate in an independent exercise program
• a score of less than 3 on the SCOFF eating disorders questionnaire
• less than 30 minutes per day of self reported moderate or vigorous physical activity
• regular Facebook use as defined by self reported owning of an account and use of at least 30 minutes per day
• willing to provide informed consent
• willing to participate in the intervention
• literate in the English language.