A. Thematic analysis: Help‐seeking questions (relating to Rickwood et al. 11 help‐seeking process)

For the first help‐seeking post:

(1) Where do you think they are in the help‐seeking process? (2) What key evidence makes you think this? (3) Can you suggest any potential barriers (what may be stopping them) and the facilitators (what may be motivating them) to seeking help at any of these stages?

For peer‐supporter posts:

(1) What do you think may be most helpful to encourage help‐seeking? (2) What do you think may not be helpful?

For subsequent help‐seeking posts:

(1) Where do you think they are in the help‐seeking process now (what do you think has changed)? (2) What key evidence makes you think this—relating to barriers and facilitators?

B. Conversation analysis

(1) How do you think the timings of the interactions may have impacted on the flow of conversation? (2) How do you think these could impact on feeling supported? (3) How could the sequence and flow of conversations impact on help‐seeking (think in terms of what could be a barrier and facilitator)? (4) How is the reply function used in the thread? How does it add clarity to, or confuse, the conversation? (5) What features of the text/response do you think are most important to encourage an interaction/longer conversation? (6) What features of the text/response do you think stops a conversation happening? (7) What happens to the conversation when other ‘posters’ (help‐seekers or peer supporters) ‘jump’ in between a pair having a conversation?