Table 1.

“Positive Peers” functions mapped to social media affordances.

App function	Affordance	Affordance definition
Reminders, blogs, daily inspiration, forum, chat, and entire app	Accessibility	Convenient to use, easy to message anytime, and few structural barriers or gatekeepers
Blogs, daily inspiration, forum, and chat	Bandwidth	Richness of information one can convey (eg, nonverbal cues and expressed emotion)
Forum, chat, daily inspiration, and tales of triumph	Social presence	Perceived interpersonal closeness or immediacy of others on the channel
Chat	Privacy	Only the user can see the communication or messaging with another
Forum	Network association	Multiple users can participate in an interaction and other users can see who is communicating with whom
Reminders, forum, and chat	Personalization	Freedom to tailor messages and direct communication to select people
Blogs, tales of triumph, forum, and resources	Persistence	Permanence of messaging, permanence of content, and a record of activity
Reminders, forum, and chat	Editability	Ability to delete or edit messaging and ability to edit before posting
Forum and chat	Conversation control	Freedom to enter or end conversations
Forum, chat, and entire app	Anonymity	Channel blinds the user’s identity or allows the user to create an identity