Table 1.

Items, interview guides, and social media analysis in the prototype.

Items	Interview guide	Social media analysis
Depressed mood	How would you describe your mood in the past several days?	Number of depression-indicative posts
Suicidal thoughts	In the past several days, have you felt that life was not worth living, or that you would be better off dead?	Number of suicidal thought indicative posts
Insomnia	How have you been sleeping in the past several days?	Number of Facebook posts between midnight and 5 AM
Diurnal variation	In the past several days, have you noticed feeling worse at any particular time of day—such as in the morning or evening?	Number of depression-indicative posts by 4 time frames
New friends	Tell me about your social life. Do you have friends? If yes, how many friends would you say you have?	Number of accepted friend requests
Social ties	Are they casual or close friends?	Number of messages and recipients
Frequency of social interactions	How often do you see friends?	Number of posts with location and tagging