Table 2.

Description of various measures of Facebook engagement

Type of measured Facebook interaction	Description of Facebook interaction
Views	This measure assesses the number of views a post to Facebook received. Facebook shows the number of views for each post and who has viewed each post. This corresponds to whether or not the post was visible on an individual’s Facebook page when they logged on.
Likes	Participants could click on a “Like” icon in response to counselor or participant posts (indicating approval or agreement with the statement). Likes counted each day included both likes for the original post and likes for the comments on the post. If a participant liked someone else’s comment on their original post, this was counted as a like on the original post.
Comments (including poll votes)	Comments (responses to a counselor-initiated post) and poll votes (votes cast to a poll posted by a study counselor) were combined into one type of engagement, given that both were made by participants in response to a post or poll from counselors.
Participant-initiated posts	Participant posts were posted by a participant not in response to a counselor post or a comment on a counselor post. These were posts by a participant posted to the group’s Facebook page.
Responses to participant-initiated posts	This was measured as the number of views, likes, and comments that other participants made in response to a participant-initiated post.