Figure 1 is a column graph showing the number of participants recruited each day from 1 April to 31 May 2015. There were a total of 8,884 participants recruited during this period. Notable recruitment activities included: on 8 April 2015 a request was emailed to 3,000 of existing participants to invite friends to join the survey, and 379 participants were recruited nationally from 8-9 April 2015; on 14 and 15 April 2015 an email was sent to all remaining existing participants asking them invite friends to join the survey, and 2,380 participants were recruited nationally from 14-17 April 2015; the first Flutracking survey was emailed to all active participants on 27 April 2015, and 1075 participants were recruited nationally on 27-30 April 2015; and the second Flutracking survey was emailed out to participants on 4 May 2015, and 1,155 participants were recruited nationally on 4-8 May 2015.