However, as demonstrated by recruitment rates in Phase 2, even when recruitment through traditional sources was expanded and actively engaged, their contribution to recruitment was modest, while social media contributed significantly to the sharp increase in recruitment rates, thus increasing the overall efficiency of recruitment.It is also likely that awareness through social media contributed to general interest in the study, including word-of-mouth referrals as seen in other studies [9], [10], and may have influenced some of the recruitment from traditional healthcare-based sources.