article_snippet.sent: Once a user has read and accepted the terms and conditions, which doubles up as a consent form, The researchers are presented with health surveys
article_snippet.sent: Once a user has read and accepted the terms and conditions they are presented with health surveys health surveys can complete each day.
article_snippet.sent: These questionnaires relate to a user's health, habits, attitudes, and relationships and the Health Tracking Surveys provide detailed information about how a person's health changes over time.
article_snippet.sent: After completing each survey, uses can view each survey own results as well as see summaries about other how their own results compare to other participants.
highlights_snippet.sent: Participants complete Health Tracking Surveys via an app on Facebook .
  