Table 2.

Question guide.

Type of question	Questions	Possible aspect of diffusion of innovationa,b
Introductory question	Please introduce yourself and tell the group about your professional role and experience.
Transition question	You were invited to this focus group because you are a member of ICUConnect. Could you explain what prompted you to join?	Type of adopter; homophily; influence of peers
	Do you use any other social media or online communities for professional networking and development?	Type of adopter; external orientation; interconnectedness; Innovation characteristics of social media
Key question	What do you value most about ICUConnect?	Access to colleagues (homophily), external orientation; interconnectedness; Innovation characteristics of social media
	What are the least valuable aspects of ICUConnect?	Innovation characteristics of social media
	What advantages or disadvantages does ICUConnect have over other social media?	See above
	Current research indicates that there are active users of virtual communities (individuals who post) and passive users (individuals who mainly read &/or share). How would you describe how you use ICUConnect?	Type of innovator: role of individual in local social network
	Do you share ICUConnect posts with other professional colleagues?	Role of individual in local social network; external orientation
	Is there a post in the past 3 months that has been of high relevance to you?	Knowledge (innovation) on IC-VC is credible
	Have you been able to use any posts from the last 6 months of discussions?	As above
Concluding question	Are there any other important aspects of ICUConnect that we have not discussed?	As above

^a[5,13].

^bSee Figure 1 and Multimedia Appendix 1.