. 2022 Aug 17;24(8):e34705. doi: 10.2196/34705

Table 1.

Annotation scheme of content categories organized along two dimensions: message type and underlying perspective about suicide.

Message type		Underlying perspective
		Problem and suffering	Solution and coping
Personal experiences first or third person		Suicidal ideation and attempts^a	Coping (Papageno)^a
News about experiences and behavior		News suicidal ideation and attempts	News coping
Experience of bereaved		Bereaved negative	Bereaved coping
Case reports		Suicide cases (Werther)^a	Lives saved
Calls for action		Awareness^a	Prevention^a
Irrelevant^a
	Suicide other	Murder-suicides, history, fiction, not being suicidal, and opinions
	Off-topic^b	Bombings, euthanasia, jokes, metaphors, and band or song names

^aThe 6 main categories classified in machine learning task 1.

^bTask 2 distinguished the off-topic category from all other categories (see Classification Tasks).